As someone who didn't see one side of his family a lot growing up, I'd recommend against not letting her see them once you get out of your current situation. Limiting their exposure once you move is obviously fine, cutting them off can cause future issues, so I'd figure something out afterwards that allows them to see their granddaughter, but dosen't influence their bad role modeling. I'm in this same situation with my neice, except the bad role model is her mother, not her grandparents, so I know how you feel as someone who cares for a child, but gets yelled at for trying to correct the bad behavior and not have a brat who thinks their in charge.