I'm bipolar 2, with severe/crippling anxiety and extremely obsessive, strange thoughts. The latter, I've been told by my pdoc, is because of OCD. Obviously, I have no clue what may be going on with you, but when I described similar thoughts to my shrink, he said OCD. I know that I get really freaked out sometimes by completely benign things. Ex: My landlady came by to my neighbor's house. She didn't approach me, or really even look my direction, from that day and for about a week later, I was absolutely convinced she was going to kick me out of my house (she has no logical reason to do this). I couldn't make myself walk out of the door of my house no matter how much I could logically convince myself that this fear was absurd. It actually took my BF talking to the lady and assuring me that everything was fine before I could even do anything other than continuously look out the window, terrified she would be out there, jump at every passing car (thinking it was her), etc. As far as the boyfriend of your daughter, I just don't know what to say other than I have intrusive thoughts about extremely strange/sometimes hurtful/weird/scary things that I would NEVER do, but the ideas pop into my head and I cannot stop them, in fact, when I try, it usually makes it way worse.

Hell, saying all of this "out loud" makes me feel really freaking weird.