Therapy

I have my first appointment with a therapist on Monday. I have severe depression and anxiety and just started medication for it. My mom plays a big part in my issues that I have going on. One of them being that she constantly leaves my younger brothers and sister with me while she goes off to play house with her new boyfriend. Sometimes we go months before she comes to see them for a few hours and then leaves again. I want to talk to my therapist about it but idk if that would get my mom in trouble with the police or anything. I am a 27 year old adult, so they aren’t left with another minor or anything , but I just don’t know what would happen if I told anyone what’s been going on. Does anyone know how that works?