Divorce is Hell.....Custody too

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I'm still having a rough time. I hardly have any contact with my H, he calls the kids on their cells. The only main contact I have are nasty texts I get on a regular basis. Now it is about tax filing. Now my S12 is fighting me on custody. He continually wants to stay with his father on "my" days. We only have a verbal agreement which is 50/50 but it has worked for us up until this. He has been sick and on my scheduled night to get him last night I was texted that he was asleep finally, let him sleep get him in the morning. I called and said I would do that. When I got there this morning S12 would not come out of the house and kept calling my cell. He contacted his father at work several times during the ordeal. I told him I would come in and get him, with the police if necessary. I knew I couldn't. He finally came out and I had a long talk in the car that went in one ear and out the next. His father says his lawyer said any child over 10yrs old can decide where they want to be. BS. So I am filing custody papers as soon as I can get the $. That is the hold up to all of this. Trying to rent a room to get income and had no luck. Anyone have any knowledge of custody issues in PA?