Find the odd one out.

Family members are J, M, Q, R, S, T, X and Y.

1) R is the father – in – law of X’s daughter – in – law. That means R is the husband of X.

2) Q has only one niece. That means Q’s sibling has a daughter.

3) Y is the grandchild of X. Therefore, Y is the daughter of S.

4) M does not have any sibling.

5) Q is the brother – in – law of S. The only possibility is Q has a sibling who is a spouse of S.

Since M does not have any sibling the only possibility is M is the wife of Q.

6) J is the only sister of S’s spouse father. So, J is the sister of R.

7) M and T has same gender. So, T is female and wife of S.

The blood relation diagram is as follows:

Since, all except SQ has one generation gap but in SQ both comes from same generation.

Hence, the correct answer is SQ.