My question is: There are supposedly pictures on the laptop of atleast 1 minor on the laptop. Does this tie in with those pictures? If it does, then that's pretty much checkmate there.

The title of the Gateway Pundit story is clickbaity. They were confronted with an accusation and moved to dismiss/squash it without looking into the veracity of the claim. A father/brother aren't going to want to take a claim like that at face value even with how messed up the son is. Doesn't prove they know it was true, just shows they're aware of the accusation.