Reasoning

Blood Relations: Practice Questions with Answers

89 practice questions on Blood Relations, with answers; most also have an explanation or a worked solution. Try each one before you open its answer.

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1. Q.1

   X is Y's wife. Z is Y's brother. How is Z related to X?

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   Answer: Z is X's brother-in-law

   Solution:

   1. Y is X's husband. Z is Y's brother, which makes Z the brother of X's husband.
   2. The brother of one's husband is one's brother-in-law.

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2. Q.2

   A is the brother of B. C is the sister of A. How is C related to B?

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   Answer: C is the sister of B

   Solution:

   1. A and B are siblings (A is B’s brother).
   2. C is A’s sister, so C is also a sibling of A — and therefore of B.
   3. Since C is specified as female, C is B’s sister.

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3. Q.3

   In a family, P and Q are married. They have a daughter, R, who is married to S. R and S have two children, T and U. How many members are there in this family?

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   Answer: 6 members

   Solution:

   1. List everyone named: P, Q (the original couple), R (their daughter), S (R's husband, who joins the family by marriage), T and U (R and S's children).
   2. Count the list: P, Q, R, S, T, U = 6 members.

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4. Q.4

   Introducing a man, a woman says, ‘He is the only son of my mother’s mother.’ How is the man related to the woman?

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   Answer: The man is the woman’s (maternal) uncle

   Solution:

   1. "My mother’s mother" is the woman’s (maternal) grandmother.
   2. The grandmother’s only son is the brother of the woman’s mother — i.e., the woman’s maternal uncle.

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5. Q.5

   A's mother is B's daughter. If B is male, how is B related to A?

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   Answer: B is A's maternal grandfather

   Solution:

   1. B's daughter = A's mother, so B is the PARENT of A's mother — not a sibling of A's mother.
   2. Since B is male and is the father of A's mother, B is A's maternal grandfather.

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6. Q.6

   A and B are sisters. C is A’s son. D is B’s brother. How is D related to C?

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   Answer: D is C’s (maternal) uncle

   Solution:

   1. A and B are sisters, so they share the same siblings.
   2. D is B’s brother, so D is also A’s brother.
   3. C is A’s son, and D is A’s brother — so D is C’s maternal uncle.

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7. Q.7

   Pointing to a man, a woman says, ‘His mother is the only daughter of my mother.’ How is the woman related to the man?

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   Answer: The woman is the man’s mother

   Solution:

   1. "The only daughter of my mother" — the woman herself is a daughter of her mother, and since there’s only one, that daughter must be the woman herself.
   2. So "his mother" = the woman herself.

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8. Q.8

   Pointing to a girl, a man says, ‘She is the daughter of my sister.’ If the man has only one sister, how is the girl related to the man?

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   Answer: The girl is the man's niece

   Solution:

   1. The girl's mother is the man's sister, so the girl is the man's sister's daughter.
   2. A sister's daughter is one's niece.

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9. Q.9

   Pointing to a photograph, a man says, ‘She is the daughter of my father’s only son.’ If the man has no brothers, how is the woman in the photograph related to him?

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   Answer: Daughter (the man himself is his father’s only son)

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10. Q.10

    In a family, M and N are married. They have one son, O, who is married to P. O and P have two children, Q and R. How many members are in this family?

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    Answer: 6 members: M, N, O, P, Q, R.

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11. Q.11

    Pointing to a girl, a man says, ‘She is the daughter of my sister.’ If the man has only one sister, how is the girl related to the man?

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    Answer: Niece.

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12. Q.12

    X is Y's wife. Z is Y's brother. How is Z related to X?

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    Answer: Brother-in-law.

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13. Q.13

    Introducing a man, a woman said, ‘His wife is the only daughter of my father.’ How is the man related to the woman?

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    Answer: Husband (the only daughter of the woman’s father must be the woman herself)

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14. Q.14

    A's father is B's son. If B is female, how is B related to A?

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    Answer: Paternal grandmother — B's son is A's father, so B is one generation above him, and since B is female, she is his mother, making her A's grandmother on the father's side.

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15. Q.15

    P is the brother of Q. R is Q's mother. S is R's husband. How is S related to P?

    1. A Father
    2. B Grandfather
    3. C Uncle
    4. D Brother-in-law
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    Correct answer: (A) Father

    R is Q's mother, and since P is Q's brother, R is also P's mother. S, R's husband, is therefore P's father.

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16. Q.16

    A and B are sisters. C is A's husband. How is C related to B?

    1. A Brother-in-law
    2. B Brother
    3. C Husband
    4. D Cousin
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    Correct answer: (A) Brother-in-law

    C is the husband of A, who is B's sister — the husband of one's sister is one's brother-in-law.

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17. Q.17

    P is R's father. Q is R's sister. S is Q's husband. How is S related to P?

    1. A Son-in-law
    2. B Son
    3. C Brother-in-law
    4. D Nephew
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    Correct answer: (A) Son-in-law

    Q is R's sister, and P is R's father, so P is also Q's father. S, married to Q, is therefore P's son-in-law.

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18. Q.18

    Introducing a man, a woman says, "He is the only son of my mother's mother." How is the man related to the woman?

    1. A Maternal uncle
    2. B Brother
    3. C Father
    4. D Cousin
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    Correct answer: (A) Maternal uncle

    "My mother's mother" is the woman's grandmother. The grandmother's only son is the brother of the woman's mother - her maternal uncle.

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19. Q.19

    P's son is Q. Q's sister is R. R's husband is S. How is S related to P?

    1. A Son-in-law
    2. B Son
    3. C Brother-in-law
    4. D Nephew
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    Correct answer: (A) Son-in-law

    R is P's daughter (Q is P's son, and R is Q's sister); S is married to R, so S is P's son-in-law.

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20. Q.20

    A's son B is married to C. D is the daughter of C's mother. How is D related to B?

    1. A Sister-in-law
    2. B Sister
    3. C Wife
    4. D Cousin
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    Correct answer: (A) Sister-in-law

    D, the daughter of C's mother, is C's sister. Since B is married to C, D is B's sister-in-law.

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21. Q.21

    X's father is Y. Y's only daughter is Z. X is not Z. How is Z related to X?

    1. A Sister
    2. B Daughter
    3. C Mother
    4. D Aunt
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    Correct answer: (A) Sister

    Y is the parent of both X and Z. Since Z is Y's only daughter and X is not Z, X must be Y's son. So Z, being Y's daughter, is X's sister.

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22. Q.22

    M is N's wife. N's sister is O. How is O related to M?

    1. A Sister-in-law
    2. B Sister
    3. C Wife
    4. D Cousin
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    Correct answer: (A) Sister-in-law

    N is M's husband, and O is N's sister — the sister of one's husband is one's sister-in-law.

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23. Q.23

    L has a son M and a daughter N. N is married to O. How is O related to M?

    1. A Brother-in-law
    2. B Brother
    3. C Cousin
    4. D Father-in-law
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    Correct answer: (A) Brother-in-law

    N is M's sister, and O is N's husband — the husband of one's sister is one's brother-in-law.

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24. Q.24

    Pointing to a photograph, Arjun says, "She is the only daughter of my mother's mother." How is the woman in the photograph related to Arjun?

    1. A Mother
    2. B Sister
    3. C Grandmother
    4. D Daughter
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    Correct answer: (A) Mother

    "My mother's mother's only daughter" is Arjun's maternal grandmother's one and only daughter — and Arjun's own mother is necessarily one of her mother's daughters. If she is the ONLY daughter, that daughter must be Arjun's mother herself.

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25. Q.25

    Z says, "A's mother is the only sister of my father." How is A related to Z?

    1. A Cousin
    2. B Brother
    3. C Nephew
    4. D Uncle
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    Correct answer: (A) Cousin

    "My father's only sister" is Z's paternal aunt. Since that aunt is A's mother, A and Z share a grandparent — they are cousins.

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26. Q.26

    Rohan has exactly one sister. Pointing to a girl, he says, "She is the daughter of my only sister." How is the girl related to Rohan?

    1. A Niece
    2. B Daughter
    3. C Sister
    4. D Cousin
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    Correct answer: (A) Niece

    Rohan's only sister's daughter is the child of his sibling, making the girl Rohan's niece.

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27. Q.27

    A's son is B. B is married to C. C's mother is D. How is D related to A?

    1. A A's son's mother-in-law
    2. B A's wife
    3. C A's daughter
    4. D A's sister
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    Correct answer: (A) A's son's mother-in-law

    B is A's son, and C (D's daughter) is B's wife — so D, being the mother of A's son's wife, is A's son's mother-in-law. (D has no direct blood relation to A.)

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28. Q.28

    Rita says to Mohan, "Your father's only brother is my husband." How is Rita related to Mohan?

    1. A Aunt
    2. B Mother
    3. C Sister
    4. D Cousin
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    Correct answer: (A) Aunt

    Mohan's father's only brother is Mohan's paternal uncle. Since that uncle is Rita's husband, Rita is Mohan's aunt.

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29. Q.29

    A and B are husband and wife. C is A's sister. How is C related to B?

    1. A Sister-in-law
    2. B Sister
    3. C Wife
    4. D Cousin
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    Correct answer: (A) Sister-in-law

    C is A's sister, and A is B's spouse — the sibling of one's spouse is a sister-in-law.

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30. Q.30

    A is B's husband's brother. B is C's mother. How is A related to C?

    1. A Uncle
    2. B Father
    3. C Grandfather
    4. D Brother
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    Correct answer: (A) Uncle

    B's husband is C's father, and A is that husband's brother — making A C's paternal uncle.

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31. Q.31

    Pointing to a boy, a man says, "He is the son of my father's only son." If the man has no brothers, how is the boy related to the man?

    1. A Son
    2. B Nephew
    3. C Brother
    4. D Grandson
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    Correct answer: (A) Son

    Since the man has no brothers, "my father's only son" refers to the man himself. So the boy, being "his" son, is the man's own son.

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32. Q.32

    A is B's wife. C is A's son. D is C's sister. How is D related to B?

    1. A Daughter
    2. B Niece
    3. C Sister
    4. D Granddaughter
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    Correct answer: (A) Daughter

    As A and B are husband and wife, their children C and D are shared; D, being C's sister, is B's daughter.

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33. Q.33

    A is the son of B's sister. C is B's husband. How is C related to A?

    1. A Uncle
    2. B Father
    3. C Brother
    4. D Nephew
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    Correct answer: (A) Uncle

    B's sister is A's mother, so B is A's (maternal) aunt; C, B's husband, is therefore A's uncle.

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34. Q.34

    X's father Y has only one sister, Z, who is married to W. How is W related to X?

    1. A Uncle
    2. B Father
    3. C Brother-in-law
    4. D Grandfather
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    Correct answer: (A) Uncle

    Z, X's father's only sister, is X's aunt; W, married to Z, is therefore X's uncle.

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35. Q.35

    Pointing to a boy, a woman says, "His mother is the only sister of my brother." How is the woman related to the boy?

    1. A Mother
    2. B Aunt
    3. C Grandmother
    4. D Sister
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    Correct answer: (A) Mother

    "My brother's only sister" is the woman herself, so the boy's mother is the woman - she is the boy's mother.

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36. Q.36

    D is the daughter of E. F is the son of D. How is E related to F?

    1. A Grandmother or grandfather
    2. B Mother
    3. C Aunt
    4. D Sister
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    Correct answer: (A) Grandmother or grandfather

    D is F's mother, and E is D's parent — so E is F's grandparent (grandmother if E is female, grandfather if male; E's gender isn't specified here).

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37. Q.37

    A and B are sisters. C is A's son. D is B's brother. How is D related to C?

    1. A Maternal uncle
    2. B Father
    3. C Cousin
    4. D Grandfather
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    Correct answer: (A) Maternal uncle

    D (B's brother) is also A's brother since A and B are sisters. C is A's son, so D is C's maternal uncle.

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38. Q.38

    Priya is Rohit's daughter. Rohit's only brother is Aman. How is Priya related to Aman?

    1. A Niece
    2. B Daughter
    3. C Sister
    4. D Granddaughter
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    Correct answer: (A) Niece

    Aman is Rohit's brother, so Aman is Priya's paternal uncle. The question asks the relation the other way round — Priya, as Aman's brother's daughter, is Aman's niece.

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39. Q.39

    Pointing to a man, a woman says, "His mother is the only daughter of my mother." How is the woman related to the man?

    1. A Mother
    2. B Sister
    3. C Aunt
    4. D Daughter
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    Correct answer: (A) Mother

    The woman herself is her mother's only daughter, so "his mother" = the woman herself, making her the man's mother.

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40. Q.40

    P's mother and Q's father are siblings. R is Q's sister. How is R related to P?

    1. A Cousin
    2. B Sister
    3. C Niece
    4. D Aunt
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    Correct answer: (A) Cousin

    P's mother and Q's father being siblings makes P and Q cousins; R, Q's sister, is therefore also P's cousin.

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41. Q.41

    P is the father of Q. Q is the sister of R. How is R related to P?

    1. A Son or daughter (child)
    2. B Son only
    3. C Daughter only
    4. D Grandchild
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    Correct answer: (A) Son or daughter (child)

    R is P's child (since Q, P's child, has R as a sibling), but R's own gender is never stated, so only "son or daughter" can be concluded.

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42. Q.42

    A is B's husband's sister. C is B's son. How is A related to C?

    1. A Aunt
    2. B Mother
    3. C Sister
    4. D Grandmother
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    Correct answer: (A) Aunt

    A is B's husband's sister, i.e. the sister of C's father (since C is B's son); so A is C's aunt.

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43. Q.43

    A is B's father's father. C is B's mother. How is C related to A?

    1. A Daughter-in-law
    2. B Daughter
    3. C Granddaughter
    4. D Wife
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    Correct answer: (A) Daughter-in-law

    A is B's paternal grandfather, meaning A's son is B's father. C, as that son's wife, is A's daughter-in-law.

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44. Q.44

    X is Y's husband. Y's mother is Z. How is X related to Z?

    1. A Son-in-law
    2. B Son
    3. C Husband
    4. D Brother
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    Correct answer: (A) Son-in-law

    Y is X's wife, and Z is Y's mother — so Z is the mother of X's wife, making X her son-in-law.

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45. Q.45

    Introducing a boy, a man says, "His mother is the only daughter-in-law of my mother." If the man has no brothers, how is the boy related to the man?

    1. A Son
    2. B Nephew
    3. C Grandson
    4. D Brother
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    Correct answer: (A) Son

    My mother's only daughter-in-law (since I have no brothers) is my own wife; so the boy's mother is my wife, making the boy my son.

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46. Q.46

    X is the father of Y. Y is the husband of Z. Z is the mother of W. How is X related to W?

    1. A Grandfather
    2. B Father
    3. C Uncle
    4. D Brother
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    Correct answer: (A) Grandfather

    Y is Z's husband and Z is W's mother, so Y is W's father. Since X is Y's father, X is W's (paternal) grandfather.

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47. Q.47

    Introducing a boy, a man says, "He is the son of my wife's brother." How is the boy related to the man?

    1. A Nephew
    2. B Son
    3. C Cousin
    4. D Brother
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    Correct answer: (A) Nephew

    The man's wife's brother is his brother-in-law; that brother-in-law's son is the man's nephew.

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48. Q.48

    A is B's daughter. C is B's husband. D is C's mother. How is D related to A?

    1. A Grandmother
    2. B Mother
    3. C Mother-in-law
    4. D Aunt
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    Correct answer: (A) Grandmother

    C is B's husband, i.e. A's father (since A is B's daughter); D, C's mother, is therefore A's grandmother.

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49. Q.49

    Pointing to a woman, Rohan says, "She is the only daughter of my father's mother." How is the woman related to Rohan?

    1. A Aunt
    2. B Mother
    3. C Sister
    4. D Niece
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    Correct answer: (A) Aunt

    Rohan's father's mother is his paternal grandmother; since the father is a son (not a daughter), her only daughter must be the father's sister - Rohan's aunt.

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50. Q.50

    P is Q's mother's father. R is Q's father. How is R related to P?

    1. A Son-in-law
    2. B Son
    3. C Brother-in-law
    4. D Grandson
    Show answer

    Correct answer: (A) Son-in-law

    P is Q's mother's father, i.e. Q's maternal grandfather; R, Q's father, is married to P's daughter (Q's mother), so R is P's son-in-law.

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