How is child custody handled when one parent is in one state and the parent that has allegations is in another?

Question by different drummer: How is child custody handled when one parent is in one state and the parent that has allegations is in another?
Does it go by:

1. The state that the mother resides in, the state that the father resides in, or the state that the divorce and child support order occured? Or is that not relevant at all?

2. Or does it go by the state in which the parent seeking full custody resides in, can that parent initiate in their state before returning a child back to their other parent at the end of their…

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