Adoption/Foster parents Help

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My bf stepmoms niece have a son. As soon as I can be told her address and last night I plan to call cps. She hits him when she mad at other people (just found this out 2 days ago) when they was telling me she smacked him in the face because her boyfriend pissed her off and apparently one time she dropped him off with blood around his nose and he looked like he had been hit also just found this out. She beats him for no reason. She have lots of different men around him. Around new years there was this incident where she threaten to put him on the car roof and drive off because his dad wouldn't take him. (His dad was homeless and it was cold so he didn't want to have him in his situation). She ended up pulling off and leaving him in the parking lot with his dad. I have heard her say something about giving this kid half a Vicodin before after I comment she said I was just joking. I didn't know anything about her at the time so I dropped it. She has had a child taken before for hitting him. My bf stepmoms for some reason has not and will not call cps. She say I tell her I better not see that no more and keeps the little boy for long periods of time. Her favorite thing to say is I don't mess with cops or well I'm keeping him right now. Honestly he don't need to be there either but that's a different story. Me and my bf had a long hard talk about it and decided that we will have no problems taking him. We don't have alot of finance right now so hopefully that's not a big problem but here he will not be abused. I think this has already caused issues with the child. He is either 2 or almost 2 and does not speak only holler and nobody has tried to potty train him. We have a two bedroom and if ok he can share a room with our son until we find a bigger place. Idk if they will let me have him but after finding out everything she don't deserve him. I refuse to sit around while a helpless kid is getting abused and not say anything or do anything.