I'm sorry you're going through this bavman.
I thought for awhile as to how to respond and finally today sent a simple e-mail back saying I regarded their' card as spiritual and emotional abuse. That my family left me and I have no family. Please stop harrassing me and leave me in peace.
But this was perfect! They probably, truly, have never seen it from this perspective before; so I think it's good you've let them know how their words and actions affect you. They just may think!
Best wishes to you and them.