Those women with whom nikaah is not permissible

Q: My question is can a Sunni man marry a woman who is a Zaidi (Shia) since Zaidi's are closer to Sunnis than Shias?

Q: Does a woman become a kaafir if she gets married to or has a relationship with a catholic?

Q: My question is can I marry with my widow sister in law. My wife is alive and she is living with me?

Q: If a person marries a non Muslim who doesn't convert to Islam even after marriage and also marries his Muslim sister to a hindu. Is that person and his family outside the fold of Islam?

Q: My mum got married to my dad when she was very young. I was a result of that marriage that didn't last. After few years my she married a man that became my dad in every way. I got married and had kids my wife is a cancer patient and gave me permission to mary again. On the night of my walimah I found out that my dad got married again after my mum and had 2 kids a boy and a girl. He got divorced again and married another woman from whom he had a daughter who happens to be my second wife. We already consummated our marriage. I am so confused.

Q: My question is if a non Muslim girl accepts Islam then will marrying her be accepted in Islam?

Q: If a hindu girl is ready to convert to Islam just to marry a muslim boy she loves, is it ok to marry her?

Q: Can you get married to a Christian or Jewish woman? What are the Islamic laws in regard to marrying a Christian or Jewish woman?

Q: Can I pray for a non-muslim guy to accept Islam. I want to get married to that guy if he accepts Islam.

Q: Can someone marry his sister in law (sali) at same time while he is already married to her sister? I mean can I marry my sister in law (Sali) without leaving my wife?