In Louisiana, a Judge looks at the Article 134 factors in determining the best interest of the child and in awarding custody. One of those factors is the child's preference if the court determines that he is of sufficient age to make that decision. Usually a 13 year old is of sufficient age. So if you were in Louisiana, it would be only be one factor. The answer to your second question would be yes. If your child is no longer living with you and living with the other parent who is paying child support, they can request a cancellation of that child support order. In other words, if you want child support, you need to have the child.