I completely am praying for you and your situation. This past Summer I lied to my mom and family about a few things and i never lie...The reason people lie is so that they dont get punished or they dont hurt another person. I pray that he will realize lying isnt going to solve anything and comes to you with the full truth. I'm sure his whole dad issue has something to do with it too :( God always answers prayers. He is an amazing powerful God! Lean on him and don't stop praying. I hope this is just a phase he's going through. I truly hope he doesnt emotionally or physically hurt another child! Stay strong!!!