Hurmat-e-Musaaharah

Q: What exactly is hurmat-e-musaaharah and what should one do if it is created?

Q: A husband touched his wife's daughter (his stepdaughter) on her breasts. What is the ruling? Does it invalidate his nikaah with his wife? If it invalidates the nikaah, can they get back together? 

Q: If a father in-law hugs and touches his daughter in-law with clothes and kisses her hands prior to her refusal, is the nikkah valid with her husband?

Q: If a person doesn't carry out any rule of Shar'iah e.g. if a person commits hurmat-e-musaharaah and doesn't confess, according to fatawa mahmoodiyah he will be sinful but if he makes sincere taubah and doesn't do it again, in the court of Allah Ta'ala will he be taken to task i.e: Will he be given punishment or will he be forgiven?

Q: If a husband touches a wife's grand mother(mother in law's mother) with lust, does the nikaah break with that husband and wife? If any female looks at a male's private part with lust but she did not see anything because his body and private part was covered with cloth, does hurmat e musaahara apply?

Q: If a father looks at his daughters private part without lust, does it constitute hurmat-e-musaahara?

Q: If a female looks at a male's private part with lust but she did not see his private part directly because the man was wearing a cloth, his body and his private part was covered with a cloth. Is hurmat-e-musaaharah established? Please answer the question. What is the private part and awra for a man?

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:

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: One day I was caressing my daughter (about 4 years old). Suddenly I felt little lust. Quickly I stopped caressing her and took her off. After this incident I repented and made tawbah to Allah Ta'ala. Does this incident affect my marriage?