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Solutions

Clues: Rita is the sister-in-law of Rohan. Saurabh is the father of Rohan.
Inference: Here we get two possibilities: Case1 and Case2.

Clues: There are two married couples in the family. Nitu is the grandmother of Sunita who is the only daughter of Abhishek. Abhishek is not the son-in-law of Nitu. Abhishek and Rohan are siblings.
Inference: Here Case 2 gets cancelled. Hence, from Case 1, we get the final arrangement:

If Urmila is the maternal aunt of Sunita, then Abhishek is the brother-in-law of Urmila
