I would firstly copy the messages to my phone (just in case) then tell my mom I saw a few of them pop up from so an so (without providing details) and that I suggest she tell my dad before I do.


End of.


If she continues to say nothing, then I show my dad myself.


I'm really sorry you've inadvertently been placed in the middle of this mess, but at least now this guy can stop coming to your house and making a fool of your father.