Family Relationship Analysis
Step 1: Analyze Each Option
- Option (1): “Father’s mother” refers to a grandmother.
- Option (2): “Sister’s father’s wife” is the sister’s mother.
- Option (3): “Paternal grandfather’s only daughter-in-law” refers to the father’s wife (mother).
- Option (4): “Brother’s wife’s mother-in-law” refers to the brother’s mother.
Step 2: Grouping Family Relations
Options 2, 3, and 4 refer to maternal and paternal family relations, and they can be grouped together. Option 1 stands out as it refers to a different type of family relation.
Conclusion:
The correct answer is (b) 2, 3 and 4.