2 months ago we got our daughter's biobrother placed with us for adoption. Things are going well, but he sometimes beats on her when we are not looking. One day I thought he was throwing a ball against the wall because I heard all these thuds. I came into the room and the thuds are his fists on my little girl. He is 25 months and she is 13 months (and tiny). We are doing timeouts for him, but is just doesn't seem appropriate punshment for something so awful. I mean, he gets the same punishment for stupid things. Sometimes, I yell at him for it just to make that timeout worse, but I don't really like that. What can I do?