You do not say if you were married. If not you must first establish your legal paternity and ask the court for a parenting plan and order of child support. In asking for a parenting plan, you need to provide evidence of the mother's "mental problems." Depending on the reality and severity of these issues, the court will likely appoint a guardian ad litem to make recommendations of what kind of parenting plan is in the best interest of the child. The parenting plan will allocate time and decision making authority between both parents. I suggest you get a lawyer.
Answered on May 22nd, 2015 at 12:17 AM