Mormon Parents

I am one of 4 siblings that have left the Mormon church. For the last 20 years all they can do is pray and write emails and talk to us all about returning to the church. We have all begged them to stop and they just won’t stop. They have told me I am following the devil by leaving the church (which to them means I’ve left God.) I am trying to figure out what to do with my parents. I no longer enjoy being around them as they constantly try to reconvert me. I have cut off contact with them and asked them to stop contacting me. This was done with anger and hurt from my side. I would like to get to the point where I can maybe speak to them again. They are getting old and I fear them dying while I am estranged from them.