step-son

Q: My husband has a son from his 1st marriage, he is 17. When we got married we used to see him at the weekends but then that stopped as it all went to court. Over the last year he made contact with my husband and they see each other every few weeks. Now his son wants to move in with us. I don't have an issue if he comes to visit but I am not comfortable with him moving in as I have a daughter from my previous marriage. She has not reached puberty yet but is 12 and will do soon.

My husband is adamant that he moves in with us. I want to know where I stand Islamically in this. My husband moved in with me into my property which I owned before I married him. My husband does own a property but his father and brother reside there.

Q: I married my husband and he has a son from his previous marriage. His son's biological mother is still alive, and when he was 8 years old, his father took him from his mother and since then he never saw his mother. With years we had two children on our own and my stepson is living with us.

My husband is away and I do most of the expenses, taking care of the three children. My husband sends me very little because his son is staying with me. I have to say, things are not very good between me and my stepson. And my husband always takes his side. I feel he doesn't give me the dignity as a wife and my marriage is falling apart, because of this I try my best to keep a good relationship with my stepson, but I can't love him as I love my own children and I really feel bad for him. And on good terms with my husband because we have 2 children. But I'm not happy.

My question is, can my stepson see his mom because his father has never allow him to do so? And what are my duties to him and my husband. All the responsibility is on my shoulder. And sometimes I want to divorce. Can I ask my stepson to leave. Please help me be because I want my stepson to be happy as well. 

Q: If a couple marries and the wife has a son that is 3 years old from her first marriage. The child has no contact with the bilogoical father and was brought up by the husband as his own child. The couple then have 2 children, a boy and girl, so 3 children in total. How would one distribute the wealth of the husband once he passes away.

Q: I plan on travelling overseas with my brother. The only issue is the accommodation wherein he has requested that I share the room with his step-son. He is currently 11 / 12 years. There shall be two single beds. Please advise if this is allowed.

Q: Can a widow step mother and step son stay alone without a mahram. My father in law passed away 2 years back and my step mother in law says that she is my husband's responsibility now. They stay together alone discussing things and as a wife I am not comfortable with this.