My husband and I are considering moving to Canada. I have a five year old son from a previous relationship. His father and I were never married and I have been the sole custodian of the child since birth. There has been no legal custody determined, and the father visits the son very rarely. He has been ordered by the state to pay child support through wage garnishment, however, he rarely keeps a job long enough to pay. He is in arrears of $7061.84 in child support, as of today. His grandmother (the father's mother)does visit my son regularly and would be very upset about the move. I believe that she would do anything in her power to keep us in Missouri, and she has the financial resources to help her son. What legal rights do I have to move with my son and what can the gradmother and father do to prevent this?