Any thoughts on family law. Advise please!?

Tough situation with no absolute answers... Try writing him a letter in the most positive, non-threatening tone you can explaining your son's need for his visitations and support. If he doesn't respond then it may be time to call your attorney and address support and visitation through the court. Support is not optional and non-payment has serious legal consequences including jail and wage garnishment. It would be bad for all if it has to reach the courts or child protection agency.