Nikaah & Marriage Issues

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: I have been reading up on Hurmat Musaaharah and had the following questions:

1. If a boy touches his sister with lust, are their children, etc. allowed to marry each other?

2. If a boy touches his cousin (parents siblings children) with lust, are their children allowed to marry each other?

Q: I am 41 years old. I got married 10 years ago. I have a daughter 9 years old and son 4 years. My wife is patient of multiple sclerosis. She has been sluggish since marriage. She cannot manage home and family matters. I am over burden as am job doing person. I want to opt second marriage and will keep first one with me. Please guide me what Islam says on this.

Q: Can we use IUD (intra uterain device) for birth control. Is it permissible?

Q: Is it permissible to reject a marriage proposal on the grounds of not being physically attracted to the person? Or does attraction only come after marriage?

Q: I am taking khula from my husband. How much money should he give to me for the iddat period?

Q: I am a 34 year old married Indian living in South Africa. I came here in 2014 alone for work, I met a Christian lady in 2015 and had sex with her, I did not know her but it happened suddenly/by chance and it was only once no more after that day, it was protected with condom. After one year that lady claimed that she gave birth to a baby girl from me, I wasn't sure with it and then I did a DNA test, the result is positive and says the baby is mine. So in this case what must I do? I cant marry her as I am already married and have 2 sons and they are with me now, I can't even adopt that child. What is the punishment of this great sin? Please advise me.

Q: Me and this guy that I met had been chatting for almost a year. He phoned my parents to ask my hand in marriage and they said no because he has been married twice before. So we got married without them knowing. I had 2 witnesses present and a Moulana did our nikah. It has been 3 weeks since we got married and I am still staying by my parents house. Now I want to run away so I can be with my husband but not sure if I should first tell my parents that I am married or just run away and deal with the stress at a later stage or should I ask for a divorce?

Q: Is it permissible to have inter-course with ones wife when there's a full moon.