I live on the other side of the country from my father, and it's been 3 years since I've seen him. He was fairly abusive to me and my sisters when we were little which is why we moved so far away. Since I moved away, he had two kids with his second wife. The daughter is 5 and gets along pretty well with him, but the 2 year old boy isn't so lucky. He is more needy and clingy and not as stoic as my father would like his "little man" to be. So he overreacts all the time and spanks him for little to no reason. Last weekend I found out from his current girlfriend (not the mother of his two newest kids) that he has on a number of occasions hit him in the face when he got mad at him, and a couple of other more worrisome things. I know I need to tell the kids' mother and probably social services, and I will, but I have a bit of a problem. I haven't witnessed any abuse, only the current g/f has. When the shit hits the fan, it will be known that she was the one who told. I'll be safe back on the other side of the country, but she'll be here to take the fallout. My father has always said he'll kill whoever gets between him and his kids - I don't think he will, but he will certainly hurt her badly. On the other hand, if I tell her in advance, she will almost certainly tip off my father in an effort to save herself - putting myself, my younger siblings and my stepmother in harm's way. Aside from reporting the abuse (which is a given), what should I do?