UP Police Constable · Bite-size lessons
Blood Relations
About 6 min · Mental Aptitude / IQ / Reasoning · English
Time worked out from the lesson's 311 words at 150 words a minute, plus a minute for each question.
Blood Relations is a core reasoning topic in UP Police Constable that tests your ability to decode family relationships from verbal statements. Questions present family connections through coded language ("A is B's father's only son") and ask you to identify the relationship between two people.
Key ideas
- Direct relationships — Parent, child, sibling, spouse — form the foundation. Mother/father, son/daughter, brother/sister, husband/wife must be crystal clear including gender implications.
- Second-generation relationships — Grandparents, grandchildren, aunts, uncles, nieces, nephews. Remember: your father's/mother's siblings become your uncle/aunt; your siblings' children become your niece/nephew.
- In-law relationships — Marriage creates new connections. Your spouse's parents are your in-laws; your children's spouses are your son-in-law/daughter-in-law; your spouse's siblings are your brother-in-law/sister-in-law.
- Only child/only son logic — "Only son" means no brothers but sisters may exist. "Only child" means no siblings at all. This distinction is a common trap in blood relation questions.
- Gender determination — Words like brother, son, father, uncle automatically tell gender. Words like child, sibling, parent require you to infer gender from context or the question itself.
Quick reference
- My father's son = My brother (or myself if only child or only son)
- My mother's only child = Myself (no siblings exist)
- My grandfather's child = My parent or uncle/aunt (depending on which one)
- Spouse's sibling = Brother-in-law / Sister-in-law (in-law relation through marriage)
- Sibling's child = Nephew / Niece (generational shift downward)
Check yourself: 3 questions
1. Pointing to a photograph, a man said, "She is the daughter of my grandfather's only son." How is the woman in the photograph related to the man?
2. A is B's sister. C is B's mother. D is C's father. E is D's mother. How is A related to D?
3. Introducing a man, a woman said, "He is the only son of my mother's mother." How is the woman related to the man?
This lesson is cut from the topic's note, not rewritten. Fact-checked on 18 Oct 2026: an AI-assisted check of this note against cited sources; the errors it found were corrected that day. Some errors may remain. The questions are from Shishya's validated question bank.
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