i filed a suit for custody of my 13 year old child he is in my possession does he have to go back?

Question

i filed a suit for custody of my 13 year old child he is in my possession does he have to go back?

Answer

Read your court order. The answer is probably "yes."

You filing a suit for custody doesn't change a court order. The JUDGE does that (by signing a modifying order, or a temporary order).