Explanation:

- Let's break this down:

- S is the mother of O.

- O is the mother of Q.

- Therefore, S is Q's grandmother.

- N is the mother of M.

- S is married, implying her spouse is the father of O.

- Q’s father is the son-in-law of M.

- Since Q and P have the same gender, one is the sibling of Q or a cousin.

- Since N is the mother of M, and Q's father is N's son-in-law, M has to be Q's mother, meaning O is also M.

?? N is related to S as her Mother-in-law.

- This makes option 1: Mother-in-law the correct answer.

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