Mommy, I have been through sort of the same thing with my JW mother & sister (my brother seems to be the only one w/ the courage of his convictions; he wrote me one "goodbye" letter & hasn't tried to contact me since). They called or wrote me every 6 months or so, letting me know how their lives were & asking me about mine (I'd moved about 2000 miles away, so not quite the same sitch, but similar). Then *I* tried calling my mother a couple of times, and got the whole "you have to come back to the truth" lecture. After the next few times they called or wrote me, I just decided to do unto them as they do unto me... My sister wrote to say she was getting married, and invited me to the wedding; I wrote back saying, "What's the point? I won't know anyone there, including you, and won't be able to go to the reception, such that we could rectify that situation." Same thing with my mom; my dad had divorced her, and she was getting re-married. She called to ask if I wanted to go to the wedding (in both cases, they offerred to pay my airfare). Why bother? My sister, over the next couple of years, sent me those cutesy-pootsy cards announcing the births of her 2 children, along with short letters. That was the last straw; I wrote to both of them saying that, if they didn't want me in their lives in a *real* way, then they should prove that they really have faith in their beliefs and just stop trying to weasel around the shunning thing. Every time I've seen them since then (I've since moved back), I've tried to be friendly and polite to them & their families, and they end up leaving before anything significant can be said by anyone.
Not saying this is what you should do in your case; just that personally, I just don't see the point of carrying on a relationship with someone (*anyone*) who thinks you are birdseed, and not worthy of association on the basis of who you are.