i think in these instances we have to be the grown ups! And also remember that although our families may shun us, it is not a sign they do not love us, it is brainwashing, and in years to come who knows but they will be here with us ...Won without a word...lol!
Horrible situation, I feel for you, but think sending a card is the appropriate thing to do, if they dont acknowledge it, it's their loss.
Poppy