Blood Relations

Blood Relations

Overview

The questions test your ability to decode family relationships from verbal descriptions or coded statements. Mastering this topic requires understanding standard relationship terms and building quick mental family trees.

The challenge lies not in complex logic but in careful reading—many students lose marks by confusing maternal/paternal sides or misreading "pointing to a photograph" statements. Since these questions have definitive answers once the tree is correctly drawn, they offer reliable marks if you practice the standard patterns.

Success demands two skills: memorizing the relationship matrix (who is what to whom) and developing a consistent notation system for sketching family trees rapidly during the exam.

Key Concepts

• Generation Levels: Family members exist at different generations. Parents are one level above you (+1), grandparents two levels up (+2), children one level below (−1), and so on. Siblings are at the same level (0).
• Two Family Sides: Maternal relations come through mother's side; paternal relations come through father's side. Uncle can mean father's brother (paternal) or mother's brother (maternal)—context determines which.
• The Pointing Trap: "A pointing to B says..." questions require you to identify the relationship of B to A, not A to B. Read the final question carefully.
• Only Child / Single Parent Clues: Statements like "X is the only son" or "Y has no siblings" eliminate possibilities and simplify the tree.
• In-Laws: Spouse relationships create in-laws. Your spouse's father is your father-in-law; your brother's wife is your sister-in-law.
• Gender Indicators: Words like son, daughter, brother, sister, nephew, niece, husband, wife directly indicate gender. Words like cousin, sibling, child, parent are gender-neutral.
• Coded Blood Relations: Some questions replace relationship words with symbols (e.g., A + B means A is father of B). Decode the legend first, then build the tree.

Key Facts

Quick Gender Reference:

• Male: father, son, brother, husband, nephew, uncle, grandfather
• Female: mother, daughter, sister, wife, niece, aunt, grandmother
• Neutral: parent, child, cousin, sibling, spouse

Worked Examples

Example 1: Direct Statement Type

Question: A is the father of B. C is the daughter of B. D is the wife of A. How is D related to C?

Solution:

• Step 1: A is father of B → B is A's child
• Step 2: D is wife of A → D is B's mother
• Step 3: C is daughter of B → C is grandchild of A and D
• Step 4: D to C relationship → D is C's grandmother

Answer: D is the grandmother of C.

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Example 2: Pointing to Photograph Type

Question: Pointing to a photograph, Ramesh said, "She is the daughter of the only son of my grandfather." How is the girl in the photograph related to Ramesh?

Solution:

• Step 1: Ramesh's grandfather's only son → Ramesh's father (since "only son" means no uncles)
• Step 2: Daughter of Ramesh's father → Ramesh's sister

Answer: The girl is Ramesh's sister.

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Example 3: Coded Blood Relations

Question: If A + B means A is the mother of B, A − B means A is the brother of B, A × B means A is the father of B, then what does P × Q + R − S mean?

Solution:

• Step 1: Decode left to right
• P × Q → P is father of Q
• Q + R → Q is mother of R
• R − S → R is brother of S
• Step 2: Build the tree:
  • P (male) married to Q (female)
  • Q is mother of R and S
  • R is male (brother), S's gender unknown
• Step 3: P is father of both R and S

Answer: P is the father of S, and S is P's child.

Common Mistakes

Confusing "pointing to" direction → In "A pointing to B says...", the question always asks about B's relation to A. Students often reverse this. Fix: Identify who is pointing and who is being pointed to before solving.

Assuming gender without evidence → "A is the child of B" doesn't tell you A's gender. Students assume male by default. Fix: Mark unknown genders with a question mark and wait for more clues.

Missing "only" qualifiers → "Only son" means no brothers exist; "only child" means no siblings at all. Ignoring these words creates phantom family members. Fix: Circle words like "only," "no other," "single" when reading.

Confusing maternal/paternal → Mother's brother is maternal uncle, not paternal. Students mix these up, especially under time pressure. Fix: Write M or P next to each relation as you build the tree.

Jumping to conclusions in coded problems → Students decode symbols mentally without writing, then make errors. Fix: Always write out the meaning of each symbol before building the tree.

Quick Reference

• Draw the tree vertically: grandparents on top, grandchildren at bottom
• Use symbols: □ for male, ○ for female, — for marriage, | for parent-child
• "Only son/daughter" eliminates siblings on that side
• In pointing questions: find relation OF the person pointed TO, with respect to the speaker
• Spouse's parent = your in-law; sibling's spouse = your in-law
• When stuck, work backward from what you need to find