Double K,
I covered this type of issue in my post yesterday. I can send you the link - it primarily covered liberal friends and not family.
Esentially, I say cut them off. Don't try to convince them of anything. Their words and opinions have meaning. They can't feel free to call our side every name in the book - including sinister and horrible things - and expect to benefit from their relationships with us.
Wish them luck and keep contact to a minumum.
Thanks Hitman, but this is my littlest one's grandfather & we really to love them and get along quite well except for this!! My current in-laws accept my 3 oldest boys from my first marriage as their grandchildren, something that a lot of people wouldn't do. and we do love them dearly. Guess we just want to "save" them :-)