Trying to help my BIL

My BIL is 17 and he's lived with us in the past because my FIL is a homophobic POS who sent my BIL to conversion therapy. I did not know everything they do in conversion therapy but his involved talk therapy along with shock therapy. I did not know that that is apart of some "conversion therapy." He left home. His mom wanted him back. CPS got involved and they made him come back under the guidelines that he wouldn't have to do that anymore. He had told us that he had an experience with a doctor. So he has a boyfriend and his parents are basically a don't talk about it situation. When he was at the doctor for his back, he said his doctor wanted to check him down there and put two fingers up his bottom without gloves and asked him how often does his boyfriend cum inside him. He told his parents and they didn't do anything about it besides told him they'll find him a different doctor. My husband talked to my FIL and said that needs to be reported and his dad said "I'm not doing all this legal stuff for that. He wants to be gay. That's part of being gay. I already said we can get him a new doctor." My husband is wanting to report this to CPS. Only problem is his brother is at the age where CPS is less likely to intervene. Is it worth trying to get custody or should we wait until July when he's 18 and just move him in with us. He's been through a lot and this just adds to things. My husband has been so stressed and emotional worrying about his brother.