Blood relations

Story hook

Sunday afternoon. The whole family has come over for lunch. You are sitting on the floor with a plate of laddoos when a small cousin tugs your sleeve and asks a tricky question:

"That uncle over there — the one laughing near the door — how is he related to me?"

You think for a second. "Well," you say slowly, "he is your mother's brother. So he is your maamaa — your maternal uncle."

The cousin's eyes go wide. "How did you know that so fast?"

Here is the lovely secret: you did not memorise it. You worked it out, one small link at a time. Mother → mother's brother → that's the uncle. You walked the chain step by step, and the answer popped out.

That is exactly what a blood relation puzzle is. Somebody gives you clues like "A is the brother of B's mother," and asks "How is A related to B?" You just draw a tiny family picture, add each clue as a line, and read off the answer.

A blood relation is simply how two people in a family are connected — like mother, son, uncle, cousin, grandmother. A blood relation puzzle gives you some clues and asks you to find one missing relation.

In this lesson we start from absolute zero. We will learn the family words, draw a simple family tree, and crack the three puzzle types the exam loves. Grab a pencil. This is the friendliest topic in the whole paper, and by the end you will solve these for fun at family lunches.

Why this matters for UPSC

For your CSAT exam (UPSC Prelims Paper II):

• CSAT is a qualifying paper. That means you do not need a high score — you only need 33% (that is 66 marks out of 200) to pass. Blood relation questions are short, need no maths, and follow a fixed recipe, so they are perfect for safely collecting those qualifying marks.
• A few of the 80 questions every year come from blood relations, directions and ranking together. Once you learn to draw the little family tree, almost every relation question becomes the same easy picture. No formulas to forget.

For real life (this is the fun part):

• Family functions — working out how a cousin, an aunt, or a great-uncle is related to you when somebody introduces them.
• Family WhatsApp groups — when an elder says "she is your father's sister's daughter," you can instantly know she is your cousin.
• Old photo albums and family trees — naming the people in a faded wedding photo from before you were born.
• Reading a will or a form — "next of kin," "spouse," "guardian" all mean exact relations, and getting them right matters.

So this is not just an exam topic. It is the everyday skill of knowing who is who in a family. And it begins as simply as spotting that "mother's brother" means uncle. Stay relaxed and follow each step.