Non-mahrams

Q: Is purdah fard for women?

Q: I was like kind of attracted to my sister in-law. About a year back my wife and I where having an argument. She was telling me that she does not like me talking to her sister and that I'm always talking to her sister etc. I always like had the thought that the rule regarding where a man touches his mother in-law with lust nikah breaks may also apply to the sister in law also. I also had doubts as to whether the rule may apply to the sister in law. I was not completely sure. Anyway, during that argument I told my wife "you know if I even touch .... (my wifes sister) nikah breaks" with no intention of any taalaq at all. I wasn't suspending or issuing a talaaq I wasn't even thinking about taalaq. I just told her that for it to seem as though that is the Islamic ruling. I just guessed/made up/lied for it to seem that that is the Islamic ruling and for her not to worry and to give assurance. I had absolutely no intention of any talaaq. The only intention I may have had was not to touch my sister in law because its a sin. After couple of months I touched my sister in-law with lust then after a few months I may have touched her with lust again. I was told by various Muftis that no talaaq or suspended talaaq takes place.

1. After getting these fatwas I have started to get strong waswasas that I had intention. I get thoughts like "think properly about your intention" "this happened so long ago how can you be so sure you had no intention". All this while I was certain that I had no intention at all, I was 100% sure. Now this waswasa is making me have doubts which is really affecting me. I was told to ignore waswasa. What I'm trying to say is that all this while I was certain I had no intention only after getting fatwas from muftis that I am safe then these thoughts came up.

2. Another thought that came to my mind was supposing the statement I made was "you know if I even touch her our nikah breaks" and not "you know if I even touch her nikaah breaks". With no intention (same situation as above in the 1st paragraph) I asked this question to another two muftis and they both told me the ruling is still the same. No talaq. 

3. Once a long time ago after getting fatwas from muftis, my sister in law sat next to me and I was so tempted to touch her and I knew that waswasa was going to start and I said in my mind only, not verbal something like "now its three talaqs and shaytaan must stop worrying me"  and allowed my body to touch against hers? Am I safe? Can that be talaaq? Regardless of the intention talaaq has to be be verbal or written for it to be valid am I correct? Am I safe? Is there any talaq in these situation? I humbly await your reply. 

​I make dua to Allah that he forgives me for the sin of touching my sister in-law with lust.

Q: My brother in law always shows anger on me and whenever he sits with others he want to show I am a little girl. He is a regular namazi but his language is bad. My husband is good man. Can you tell me any dua so that my brother in-law can keep quite about me. I am upset and because of him I often do not take my meals.

Q: Is niqaab fardh?