It depends on the child's age and where he or she lives.
In West Virginia, a child can decide which parent they want to live with when they are 18.
You have to be 18.
They have to be 18.
They have to be 18yo.
18 years
When they are 18.
You have to be 18.
When they are 18.
16
When they are 18.
Is that between a child's parents? if so it is ultimately up to the parents. But, most parents will let the child decide who they want to live with.
No, not until the child is 18.