You can install eBlaster on his PC... do you two share PC's?

If you can trap info on it then you may get the info you need.

But seriously.. This is just more to the point... You need to exit that place asap... His or not, He's behaving in a manner that's abusive to you, and as a result your son as well...

It may not be his, he's STILL looking at photos of another woman on his PC... suppose its not his? Does that make this all OK with you then?

Seriously are you comfortable with him donig this if it isn't his?

Get OUT of there and AWAY from HIM.