Doubts on hurmat-e-musaaharah

I usually get thoughts on hurmate mushahara, like when I shake my dads hand, I am scared and worried. I don't have lust but I get thoughts that suppose it is lust. My father in law is old, about 60 something and Aalim. Now he was lying down in the room and I was in the other room. It was open so I could see who was sleeping. Now I get these thoughts about lust. So my father in law was sleeping and I went to pray namaz. I was just looking at his private parts, it was not open, he had on kafni n izhaar so I couldnt see his private part and the room was kinda dark and I was a distance away. Now I didn't have any desire but I just get these thoughts about lust. I was just looking at the private part area but father in law had on his pants. So after I saw something like a penis, I was thinking that his private part was out when he was sleeping or was it a material. I saw not sure but my heart was thinking that it was not his penis showing. I just get these thoughts and I don't want them. I have no lust feeling for my father in law and I didn't look with lust. I just looked because I wanted to see if I get these thoughts. Is my nikaah valid or will hurmate mushahara apply?