Who is the grandfather of Y?

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Question

Read the following information and answer the questions. Eight member, A, B, C, M, L, Y, S and T belong to a family consists of four generations. No single person in the family is a parent. T’s father’s only sister’s father’s mother is B. M is the only daughter-in-law of A, who is married to B. C is the father of Y. L is the only sister-in-law of S. L is unmarried. Gender of T and Y is same.