How P is related to Q?

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Question

Study the information carefully and answer the questions accordingly. There are nine members in a family with four females and two married couples. L is the son-in-law of O. M is the daughter-in-law of S who is the father of T. N is the granddaughter of O. T is unmarried. P is the son of O. O is married to R who is the grandfather of Q. Q is the niece of T who is the brother of L. There could be single parent in the family.