Your daughter is not a Mahram to the boy! If you were to get married, the girl must live with her father or be totally separated from the boy.

Your future children are Mahram to both.

I am divorcee with a 10 year old daughter. I got a proposal from a pious and practicing man (also a divorcee). He has a 17 year old son. The proposal is good, however, we were only considering, will my daughter and his son be Mahram to each other after our marriage? If not, do you suggest for this marriage to take place, since his son will live with us? Also, if we do get married and I bear children and if they are females, will they be Mahram to his son?

Fiqh of the family | August 5, 2015 2:22 am
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I wonder sometimes if I am a Muslim or a kafir.The reason is that I do not and cannot get along with any of my family. I know up holding the ties of kinship is something that Allah and His prophet have enjoined and I do not deny that doing the opposite is haraam, but still there is nothing in my heart that wants to get along with them, neither for the dunya nor for Allah’s sake.
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I have only son(8 years old), I want to have another child but my husband strongly opposes to it. Are we in sin ?