8.21 Quick Revision -- Blood Relation

Family Tree Drawing Convention

  Male (M) ==== Female (F)       (Marriage)
            |
     +------+------+
     |      |      |
   Son  Daughter  Son             (Children / Siblings)

Core Relationship Terms

Chain	Result
Father's/Mother's son	Brother (or self)
Father's/Mother's daughter	Sister (or self)
Father's father	Grandfather (paternal)
Mother's father	Grandfather (maternal)
Father's brother	Uncle (paternal)
Mother's brother	Uncle (maternal)
Father's/Mother's sister	Aunt
Son's wife	Daughter-in-law
Daughter's husband	Son-in-law
Spouse's father/mother	Father/Mother-in-law
Spouse's brother/sister	Brother/Sister-in-law
Brother's/Sister's son	Nephew
Brother's/Sister's daughter	Niece

The "Only" Keyword

• "Father's only son" = self (if male)
• "Mother's only daughter" = self (if female)
• "Only child" = no siblings

Gender-Neutral Words (TRAP!)

• Cousin, Child, Parent, Spouse, Sibling, Doctor, Friend

Reverse Relationships

If A is B's...	B is A's...
Father/Mother	Son/Daughter
Brother	Brother/Sister
Uncle/Aunt	Nephew/Niece
Grandfather	Grandchild
Father-in-law	Son/Daughter-in-law

Solving Strategy

1. Read the ENTIRE problem first
2. Draw the family tree (always!)
3. Mark gender clearly (M/F)
4. Process one clue at a time
5. Trace relationship from target person

Coded Relationship -- Quick Steps

1. Write code meanings
2. Substitute one symbol at a time
3. Build mini family tree
4. Read the answer from the tree

Speed Targets

• Simple (2 people): 15-20 sec
• Photo/pointing: 30-45 sec
• 3-4 person family: 45-60 sec
• 5+ person puzzle: 60-90 sec

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