Blood Relations Cheat Sheet & Genogram Rules - IBPS PO Prelims Reasoning

Welcome to the ultimate LibreTexts-style study guide for Blood Relations in the IBPS PO (Probationary Officer) Prelims examination. Blood Relation puzzles form an integral core of the Logical Reasoning section, accounting for 2 to 4 high-yield marks in almost every exam shift. Master standard genogram notations, generation hierarchies, and sentence-decoding shortcuts to solve these questions accurately in under 45 seconds.

1. IBPS PO Prelims Exam Analysis & Weightage

In the IBPS PO Preliminary examination, the Reasoning Ability section comprises 35 questions to be solved in 20 minutes. Questions based on Blood Relations typically appear in two major formats:

• Point-based / Statement-based Puzzles: Single-question sets involving a person pointing to a photograph or introducing someone.
• Coded / Family Tree Sets: A set of 2–3 questions derived from a single complex narrative outlining relations among 6 to 8 family members.

NTA / IBPS Exam Pattern Insights: Accuracy in blood relation puzzles relies heavily on graphical representation. Candidates who attempt to mentally track relations frequently succumb to trap choices. Building a structured family tree using standardized symbols is the most reliable strategy for achieving 100% accuracy.

2. Standard Genogram Notations & Graphical Tree Construction

To convert verbal statements into a rapid visual layout, adopt the following universally accepted genogram symbols:

Entity / Relationship	Standard Genogram Symbol	Text Notation Equivalent
Male Gender	Square Box [ □ ]	\((+)\)
Female Gender	Circle [ ○ ]	\((-)\)
Married Couple	Double-headed horizontal arrow	\(\iff\)
Siblings (Same Generation)	Single horizontal line	\(-\)
Parent-Child Relationship	Vertical downward line/arrow	\(\downarrow\)

Basic Family Tree Structure Example

Consider a scenario where A (Male) is married to B (Female), and they have a son C (Male):

  [ A (+) ] <=========> ( B (-) )
                  |
                  |
              [ C (+) ]
  

3. Generation Hierarchy Mapping

Organizing individuals by vertical generation layers prevents cross-generational confusion. Structure your tree using the standard 5-generation model:

• Generation +2 (Grandparents): Grandfather, Grandmother, Maternal Grandfather, Maternal Grandmother.
• Generation +1 (Parents/Uncles/Aunts): Father, Mother, Uncle, Aunt, Maternal Uncle, Maternal Aunt, Father-in-law, Mother-in-law.
• Generation 0 (Self & Peers): Self, Brother, Sister, Cousin, Husband, Wife, Brother-in-law, Sister-in-law.
• Generation -1 (Children): Son, Daughter, Nephew, Niece, Son-in-law, Daughter-in-law.
• Generation -2 (Grandchildren): Grandson, Granddaughter.

4. Essential Relationship Terminology Shortcuts

Quick recognition of complex relationship phrasing saves critical seconds during the exam:

Expression / Phrasing	Direct Relationship Meaning
Father's or Mother's father	Grandfather
Father's or Mother's sister	Aunt
Brother's or Sister's son	Nephew
Brother's or Sister's daughter	Niece
Husband's or Wife's sister	Sister-in-law
Brother's wife	Sister-in-law
Only son of grandfather	Father (if maternal: Maternal Uncle or Father depending on context)
Only daughter of maternal grandfather	Mother

5. Golden Rules & Sentence Decoding Strategies

1. Never Assume Gender by Name: Never assign gender based on culturally gendered names (e.g., assuming "Rahul" is male or "Priya" is female) unless explicit gender markers or relationships (e.g., "father", "sister", "son") are specified in the prompt.
2. Break Down Complex Sentences Bottom-Up: For nested statements like "A is the son of B's only brother's mother," split the statement at prepositional boundaries and build the tree from the inside out: B \(\to\) B's brother \(\to\) brother's mother (B's mother) \(\to\) her son.
3. Anchor Point-Based Puzzles at Pronouns: In "Pointing to a photograph..." problems, identify possessive pronouns like "My" or "Your" to locate the starting root node. Build outwards from the speaker before linking to the subject.

6. Solved Practice Examples

Example 1: Pointing to a Person

Problem: Pointing to a lady, Rohit said, "She is the daughter of the only son of my grandmother." How is the lady related to Rohit?

Step-by-Step Solution:

1. Identify the root anchor: "my grandmother" \(\to\) Rohit's grandmother (Generation +2).
2. Evaluate the next clause: "only son of my grandmother" \(\to\) Rohit's Father (Generation +1).
3. Evaluate the final relation: "daughter of Rohit's father" \(\to\) Rohit's Sister (Generation 0).

Answer: Sister.