It is not possible to answer your question because "joint custody" is the end result of a legal case - either a paternity case or a divorce case - in which parenting responsibilities are decided by a court. If you are married, you need to file for a divorce. If you are not married, and there has never been a custody order, you need to file a custody case. If the children have been in a new state for more than 6 months, you probably have to do something in that State.
Answered on Oct 25th, 2011 at 9:02 PM