My ex and I are not agreeing on custody for our 4 year old son. He wants to move out of state to be with his girlfriend and wants joint custody of our son. I don't think that it would be good for a child that age to be traveling back and forth that much. He wants to have him for the summer and I have him for the school year. I would like full custody and to have my child only travel to the other state for two weeks over the summer. Is this reasonable? My sons whole family lives in Minnesota.