Can my ex or her mother stop my family from moving to Ohio with my daughter?

I live in the state of Mississippi and have been awarded physical custody of my 9 year old daughter, joint with her mother and her grandmother sharing scheduled visitation. My current wife and our three children (my daughter one of those children) will be relocating, at the end of the school year, to the State of Ohio for lower crime rate, better schools and a lower cost of living. In my custody paperwork, there is no clause which bars me from relocation. There is only a clause that states that if I move 50 miles or more from my current city, then extended visitation will have to be discussed and agreed to and that my new address must be disclosed to my ex within five days of the move. I have told my ex and the grandmother about the move, nearly a month ahead of time, giving them the intended moving date, new physical address and even the name of the school that my daughter will be attending next fall. Can they stop me from moving? Take my child, or anything else?