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Blood Relation Questions and Answers

Important Instructions
61.

L is the sister of G, G is the son of M. M is married with D. D is the sister of E. E is the son of C. C is married with S. S is the sister of P. How is L related to E ?

Exam Year(s)

UKPSC Lower PCS - 2025,

Answer: C

L is E's Sister's daughter.

G is the son of M, and L is G's sister, so L is a daughter of M. M is married to D, so L is also D's daughter. D is the sister of E.

So L is the daughter of E's sister. C, S and P only describe E's parents and aunt or uncle and do not change this. L is female (a sister), so 'brother's daughter' is wrong because D is E's sister, not brother, and 'daughter' or 'wife's sister' have no basis.

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62.

All six members of a family A, B, C, D, E and F are travelling together. B is son of C but C is not the mother of B. A and C are a married couple. E is brother of C. D is daughter of A. F is brother of B. How many children does A have ?

Exam Year(s)

UKPSC Lower PCS - 2025,

Answer: C

A has Three children.

B is C's son and C is not his mother, so C is the father. A is married to C, so A is the mother of B. D is A's daughter, and F is B's brother, so F is also a child of A and C.

A's children are therefore B, D and F. E is C's brother, A's brother-in-law, not her child, so the count is three, not two or four.

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63.

Pointing to a photograph of a boy Suresh said, "He is the son of the only son of my mother." How is Suresh related to that boy?

Answer: D

Correct answer: Father

Work inwards from the innermost phrase. The only son of my mother is Suresh himself - he is male and his mother has no other son. The boy is therefore the son of Suresh, which makes Suresh the boy’s father.

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64.

If A + B means A is the mother of B; A - B means A is the brother B; A % B means A is the father of B and A x B means A is the sister of B, which of the following shows that P is the maternal uncle of Q?

Answer: C

Correct answer: P - M + N x Q

Read the chain left to right. P – M makes P the brother of M; M + N makes M the mother of N; N × Q makes N the sister of Q. So M is the mother of both N and Q, and P is M’s brother - that is, the brother of Q’s mother, which is exactly what maternal uncle means.

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65.

If A is the brother of B; B is the sister of C; and C is the father of D, how D is related to A?

Answer: D

If D is Male, the answer is Nephew.

If D is Female, the answer is Niece.

As the sex of D is not known, hence, the relation between D and A cannot be determined.

Note: Niece - A daughter of one's brother or sister, or of one's brother-in-law or sister-in-law. Nephew - A son of one's brother or sister, or of one's brother-in-law or sister-in-law.

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66.

If A + B means A is the brother of B; A - B means A is the sister of B and A x B means A is the father of B. Which of the following means that C is the son of M?

Answer: D

Correct answer: M x N - C + F

M × N makes M the father of N; N – C makes N the sister of C, so C is also M’s child; and C + F makes C the brother of F, which establishes that C is male. A male child of M is his son.

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67.

Introducing a boy, a girl said, "He is the son of the daughter of the father of my uncle." How is the boy related to the girl?

Answer: A

Correct answer: Brother

Unpack from the inside. The father of my uncle is the girl’s grandfather; his daughter is the girl’s mother; and that woman’s son is the girl’s brother.

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68.

Pointing to a photograph, a man said, "I have no brother or sister but that man's father is my father's son." Whose photograph was it ?

Answer: C

Correct answer: His son

The speaker has no brothers, so my father’s son can only be the speaker himself. The sentence therefore says that the man in the photograph has the speaker for a father - so the photograph is of his son.

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69.

Pointing towards a person in a photograph, Anjali said, "He is the only son of the father of my sister's brother." How is that person is related to Anjali ?

Answer: C

Relation's given in the question may be analysed as follows :
Sister's brother - brother;
Brother's father - father;
Father's son - brother;
So he is Anjali Brother.
Note: It is more handy to solve the question when we start from end to analyse the relation as we did above.

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70.

Pointing to a photograph, Vipul said, "She is the daughter of my grandfather's only son." How is Vipul related to the girl in the photograph ?

Answer: B

Correct answer: Brother

My grandfather’s only son is Vipul’s father; the girl is his daughter, so she is Vipul’s sister and Vipul is her brother.

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