Want to give the gift that keeps on giving?
hidden camera
I know a bunch of sites that sell cheap, hidden cameras in pens, mugs, book binders, etc if you need one
Literally the smallest thing will get child protective services to rain down on your ass.
2 years ago my mom slapped my little brother in this parking lot, let a HUGE hand print on his face, next day he went to school, teacher reported it to child protective services, she got a warning. Then she flipped her stuff a second time last year, 2/3 strikes. If she looses her stuff again, CPS steps in.
Give your girlfriend a hidden camera, tell her to leave it on at all times and file any important information that helps incriminate 'daddy'
starfishs like him don't deserve to be parents.