Hate my niece’s boyfriend

Caitlyn

So as you can see from the title it says a lot but it’s not just some misguided dislike. I’ve watched him hit, bite, and choke my niece and yes I understand she’s 17 but I don’t think that it’s considered playing anymore. I’ve expressed my concerns to her and her parents but nobody seems to think it’s serious and they just laugh it off. Unfortunately I’m at the point now because I’m a little over 10 weeks pregnant that if they’re not going to do anything about it I honestly don’t want to hear about it anymore because if nothing is going to be done to stop the behavior then I don’t feel bad for her. I’m ready to call the cops on him and I don’t hide my reasons for disliking him at all even to him. Idk ladies what do y’all think?