Q24·CSAT · Prelims 2026
Reasoning — Family Blood Relations
ReasoningBlood Relations — 3-GenerationBlood Relations● Easy
Question
P has a son and a daughter. S is the mother of T. S is R's spouse. Q and R are children of P. Then how is Q related to S?
Options
a
Q is a sister of S
b
Q is a daughter of S
c
Q is the mother of S
dAnswer
Q is a sister of the husband of S
Explanation
Let us systematically map out the generations using the provided clues [cite: 3920, 3921]:
Clue 1: P has exactly one son and one daughter .
Clue 2: Q and R are the children of P. This means one of \{Q, R\} is the son and the other is the daughter.
Clue 3: S is the spouse of R, and S is a mother (which means S is female). Therefore, her spouse R must be male (the son of P).
Deduce Genders: Since R is confirmed as the male sibling (the son of P), the remaining child Q must be the female sibling (the daughter of P).
Determine Relationship: Q is the sister of R, and R is the husband of S[cite: 3920, 3921]. Therefore, Q is the sister of S's husband.
Drawing a generation tree with clear gender markers helps resolve multi-lineage family connection puzzles cleanly.
Answer: (d).
Question details
Year
2026
Paper
CSAT
Question
Q24
Section
Analytical Reasoning
Sub-topic
Blood Relations — 3-Generation
Type
Blood Relations
Difficulty
Easy
Source hint
Standard blood relations — symbolic generation tree construction
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