CPS asked the abuser her side and my side of the abuse agains my son. her word against mine. no one spoke to?

First off, I don't know what state you are in, but recorded conversations without the consent of all parties is NOT admissible in court - at least in California. I take it there is a court ordered visitation schedule. If so, you cannot keep your child from seeing the dad. You are breaking the law and that will be used against you in court. If you continue to allow your child to see dad and step mom, take pictures of child before he/she goes to dad's house and have someone else confirm the date and time that the pictures were taken. When child returns from dad's, do the same. This way you can document that the child may or may not be being hurt at dad's. You can request that the court appoint a mediator and revise the visitation. IF CPS has been called to dad's from you or anyone else, and there is documented proof that child is being abused there, you can request that dad only get supervised visitation. Good luck. Don't be nervous or accusatory in court. Keep a calm demeanor and let the judge talk. If you have the police reports and any reports from CPS, take them with you. Send a certified return receipt letter to the dad indicating that you are going to submit these documents to the judge at the next hearing. or if you have a lawyer, ask him/her to do so. Look to a law facilitator in your county court house. Ask for assistance. Contact CPS and ask for their advice as well. Again, good luck.