You minimize contact with them to the absolute minimum if they are harming you or your family in any way. However, in any condition, you cannot cut off. maybe calling upon them once in awhile to check upon them or greeting on occasions or in times of their need suffices.

What is the ruling on upholding the ties of kinship with people who force you to commit sins, ridicule you if you object, and were/are disrespectful to one’s father/mother?