i live in newyork.and am trying to relocate to georgia,and i have a daughter that is going to be 16 in july,and another that is going to be 22 in july

I also have a 20 year old son. My daughter that is not 16 yet wants to stay with her older sister in newyork,and just visit me in summer and in vacations,my question is will i loise coustody of her if my x hysbands suster tries to tske me to court. I habe sole coustody.because my x husband is in prison for attempt murder,he shot me in front of my kids in2009 . He only has like six years left in prison and i want to be out of that area.i fear for my life the time.i don't know there company he keeps in prison.my x sister in law has six i need to watch my back which means she is going to try something I'm sure. I want to keep my daughter happy and Not make her move until she is ready.she wants to only visit Georgia like this summer and on vacation ..but i also don't want to be in trouble or lose her to that family. I don't know out my oldest has a right to keep my youngest there our am i just asking for trouble from that family.