Correct option is A
Given - M is married to N. N is the daughter of U. U has been married to S . S is sister of P. P is the son of Q. R is mother of S.

Explanation

hence option a is correct.
Given - M is married to N. N is the daughter of U. U has been married to S . S is sister of P. P is the son of Q. R is mother of S.

Explanation

hence option a is correct.
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