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Answer

Correct Option is No one

Solution:As per the given conditions, first we find out the blood relation. Two persons sit between B and Q’s father who sits at one of the extreme ends. Q is grandchild of E. P is mother of Q and sits third to the left of her own sister. P’s mother-in-law is the only neighbour of D’s father. S is grandfather of Q but not father of P. C is aunt of Q. P is not sister-in-law of C. So, here we have two possible cases i.e., case1 and case2.
A has two children. A is not a female member of the family. There are three married couples in a family. D is younger than B who is spouse of A. B is not mother-in-law of P. So, case 1 gets eliminated here and the final arrangement is:Now, we find out the sitting arrangement. Q is grandchild of E and sits to the immediate right of P’s mother. Two persons sit between B and Q’s father who sits at one of the extreme ends. So, here we have two possible cases i.e., case1 and case2.P is mother of Q and sits third to the left of her own sister. P’s mother-in-law is the only neighbour of D’s father. B sits exactly in between P’s father and C. A and P’s mother-in-law doesn’t sit next to each other. A and P’s mother-in-law doesn’t sit next to each other. So, case 2 gets eliminated here and the final arrangement is:

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