Nikaah & Marriage Issues

Husband marrying wife's aunt (mother's sister)

Q: A girl is 16 years old and she got married to a 27 year old boy knowing that the boy was having an affair with her own aunty (girls mothers real sister). After one month of that girls marriage, her husband got married to her aunty. 

So my question is... is the first marriage halaal or haraam. If it is haraam then can the girl get married to another man without any divorce or khula?

Phone sex

Q: I got married in April and my rukhsati will be in October. During this time period canI talk to my wife on the phone or can we do phone sex?

Can we both masturbate while having phone sex?

Having a simple nikaah

Q: With consent from my parents and siblings, and my husbands entire family (but not his father), I had my Nikkah in November last year. As soon as we announced to my father in law, he was over the moon and incredibly happy. Some realtives also knew about the nikaah beforehand as they arranged our marriage. The Nikaah was beautifully done at the mosque in front of witnesses and my mother and sister. After the Nikaah my parents announced it to other relatives and friends. I and my family received a lot of backlash.

My question is, Islamically did we do any wrong in keeping the nikaah discreet from noise and simplifying it as best as we could? I have received love from my in-laws and family members who were generally happy. Some relatives and family members may forever hold a grudge of some sort. For my own contentment, I wanted to ask if I did anything wrong or were there any mistakes in hiding it from certain family members?

Marrying one's foster brother

Q: I really love my cousin and he love me too. We did everything together and I regret that but it’s happened now. He told his mother that he wants to get married to me. But his 2nd mother told him that she gave me milk and to him also. My mother never told me that even my father don’t know about this. Now we really love each other and we can’t leave each other. What to do?

Islamic education for one's child

Q: A father said that he will admit their child in a madrasah, but the mother said that she will not admit their child in a madrasah. The mother respects Allah and Islam, she also wants the child to know about Islam and she wants to teach the child about Islam by an Islamic teacher. The father and mother then admitted their child in a school (not an Islamic school and not a madrasah) and appointed an Islamic teacher to teach their child how to pray salaah, read Quran, duas, Islamic characters, lifestyle, etc. so that child learns about islam. Is there any sin?