child protection

I am currently witholding visitation from my son's father, under the advice of my attorney eventhough he is not representing me when we go to court in July. The last time my son saw his father was at the end of April. He came home that Sunday evening and pulled 2 beer caps out of his pocket. He told me that he got them from the park at his Daddy's and that he walked there alone with his 6 year old stepbrother(who I might add, just moved in with them that weekend)Well, my son is only 4 and his father not only allowed them to walk to that park by themselves but also to the other neighborhood park which is at least 5-6 city blocks away, there are no sidewalks, there is a lake in the center of the neighborhood with no fence around it, there are beer bottles on the playground, and the older children were picking on my son and pushing him down. In fact, one little girl tried to break open a beer bottle so that "she could cut " my son!! His stepbrother,6,in the shhort time that they were together, kicked him in the stomach twice and then kicked him in the face. I called CPS and they came to my house to speak w/my son and then talked w/ his father. I have not heard back from them but I did go to the courthouse to amend the custody papers and either take his visitation away or give him supervised. The court date is not until July 24 and everytime he calls to pick his son up, I refuse him. I told him that he will have to wait until we go to court. When I did confront him about the children picking on my son, him going to the park by himself, and his stepbrother beating up on him without getting in trouble he said that I was babying my son and that he is old enough and mature enough to go there on his own and kids fight- so what can he do about it. Oh- I almost forgot. On top of everything else- my son's bottom lip was completly swolen and busted up from his stepbrother bouncing the see saw up and down and then it hit my son. That could have and should have been prevented. Your damn right I'm going to "baby" my son because he is my life and HE IS ONLY 4 YEARS OLD!! I'm just hoping that I do not suffer consequences from the courts for witholding visitation because I am protecting my baby.
There is more to my case for anyone who has advice or insight. Look on the discussion board under Mom IN Need about the illegal tattoos and lack of child support. I posted that earlier and could still use some suggestions.
THANX!!