Nikaah & Marriage Issues

Q: If I marry a Muslim male who skips namaaz, will my nikaah with him become invalid?

Q: Can a girl be married to a family who is lower in status than her family when the family of the boy and the boy are religious people? There is no matter of kufu in this?

Q: I am a 19 year old male and currently studying Aalim course. A few years ago I had touched my mother with lust and I have finished reading the conditions through which hurmate-e-musaaharah will take place (i.e. if she had a cloth on which was thick and the heat of the body could be felt, etc). However I'm not so sure if the conditions took place or not because of it being a while ago however I have Ghaalib-e-Gumaan that the conditions took place. Is there any way out for me? Do I have to confess? Will Allah Ta'ala forgive me for this despicable sin even if I don't confess?

Q: Is it allowed to call one's mother in-law and father in-law as 'ammi' and 'abu'?

Q: Is the husband allowed to be with the wife in the labour room when she is in labour?

Q: I would like to know if my daughter from my first marriage and my brother in-law from my second marriage are haraam for each other? Can they get married? Just need clarification as to whether they are uncle and niece or not?

Q:

1. If a son or biological mother touch each other with lust, will it break the marriage relation with son's father and mother?

2. If the husband's brother touches  his brother's wife, will the nikaah break?

Q: My wife has periods wherein bleeding stops after three days. Can I get intimate with her after three days or should I wait more. Please clarify.

Q: If someone commits zina and then feels bad and wants to offer tauba and istighfaar with this hope that Allah Ta'ala will forgive him, but after tauba should he present himself before law authorities for Islamic punishment i.e sangsaar or not?