You certainly have some important questions regarding the rights of a non-custodial parent. The primary rights and duties of a parent are not contingent on the finality of a support order. Provided that paternity has already been established though birth records, acknowledgment, presumption or court order either parent can register a child for school. There should be no need to re-register, unless the child is moving to a new school. With regard to medical attention the same holds true. The issues you raise are not dependent upon establishing child support. However, with such serious questions unanswered, I would recommend you consult an attorney.