Troubling

A little over a week ago my daughter went shopping in Uvalde.  As is the custom with my kids we do a lot of talking on these trips.  (A holdover from my childhood.  My father always took us for a "drive" when he wanted to talk to us.  Maybe because that was the only way to be certain of no interruptions or ease droppers.)  So out of the blue she tells me my son has found out where his birth father is.  I went cold.  I mean really cold and tingly.  I can't even say entirely why.  My son is almost 21 so he can't be "taken away" from me.  I guess it was a flashback to my son's childhood since "legally" we never did anything about custody.  I was always afraid he would try to take my son from me especially in a mental way.  It was a scary thing.  So I found out he had done a search for him, through some internet search engine, and found him.  He's married with kids.  I admit to curiosity.  Did he tell his wife about my son?  Does he think about Nic?  Would he care?  How old are the kids and would they would want to meet Nic?  Lots of questions but I admit I really don't want to talk to the man or have any other contact with him.  He hurt me badly!  He wanted to cause trouble even after it was over.  I only hope if my son tries to contact him that Nic isn't hurt.  I don't care about the rest just that.