Question

Difficulty: Very hardBlood Relations

Read the following information about a six-member family consisting of K,L,M,N,O,K, L, M, N, O, and PP:

1. KK and LL are a married couple, where KK is the paternal grandfather of OO.
2. MM is the daughter-in-law of LL and a sibling of NN.
3. PP is a child of MM and a sibling of OO.
4. NN is unmarried and has no children.

Based strictly on the given information, how is NN related to OO?

  1. A
    Maternal uncle
  2. B
    Maternal aunt
  3. Either maternal uncle or maternal auntAnswer
  4. D
    Paternal uncle

Answer

Either maternal uncle or maternal aunt
The correct answer is that NN is either the maternal uncle or maternal aunt. MM is identified as the daughter-in-law of LL and mother of OO. Since NN is a sibling of mother MM, NN belongs to OO's maternal generation. However, because no statement specifies whether NN is male or female, the exact relation remains open between maternal uncle and maternal aunt.

Step-by-Step Solution

1
Determine the gender and generation of KK and LL
KK is male (paternal grandfather), so LL is female (paternal grandmother). They represent the first generation.
Since KK is the paternal grandfather of OO, KK must be male and married to LL.
2
Analyze MM's relationship to the family
MM is female and married to the son of KK and LL (who is the father of OO).
MM is given as the daughter-in-law of LL, meaning she is married to LL's son.
3
Determine MM's relationship to OO
MM is the mother of OO (and PP).
PP is the child of MM and sibling of OO, making MM the mother of both PP and OO.
4
Determine NN's relationship to OO and evaluate gender constraints
NN is the sibling of mother MM, but NN's gender is not explicitly stated. Thus, NN is either a maternal uncle or a maternal aunt.
In logical blood relation rules, gender cannot be assumed without explicit relational terms. Being a sibling of MM establishes NN on the maternal side, but leaves NN's gender undetermined.

Key Concept

Logical Gender Rules in Blood Relations
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