Explanation:

- S is the mother of O, making O the child of S.

- O is the mother of Q, so O must be a female.

- Q's father is the son-in-law of M.

- Given M is the mother of someone and S is married, M is likely to be the mother of I, the husband of S, making M the mother-in-law of S.

- N is the mother of M, which means N is the grandmother to I who is S's husband.

- The gender of P and Q is the same. While Q is explicitly stated, P’s specific relation isn’t defined here, but it isn't needed for this question.

- O is the daughter of S.

Given the information, Option 3: Daughter is the correct answer.