Your supervising attorney's client (Dad) is the custodial parent of his 5-year-old son and seeks to relocate with this child to another state. 

The client's former spouse (who is the other parent, Mom) opposes the relocation.  Both parents have a good relationship with the child. Under the current custody agreement, Dad has full physical custody and joint legal custody,  and Mom has partial physical custody and joint legal custody.

Can the client relocate to a state that is 200 miles from where the parents and child currently live?   What is the legal process to relocate?   What does the client need to prove? What is the law?