Legal Question in Family Law in Illinois

Are you saying your parents are stilled married/ That there is no divorce or legal separation which gives custody of you to someone. If there is, in fact, no court order regarding your custody, either parent has a right to custody of you.

Unlike the above attorney, I am assuming that your parents were never married. If that is the case, even without a court order the law presumes that your mother is the custodial parent. It also sounds like your parents have been cooperating in this arrangment for a number of years so it may be court ordered. I am not sure why you believe that custody was never established in court but as a minor absent a court order giving your father custody, you cannot simply decide to live with your father over your mother's objections without causing considerable legal trouble for your father and yourself.