Dear Elsie,
Swan, Neither of my kids is baptized. Sean, who is younger probably doesn't even remember going to meetings. I have never even studied with either of them. I guess I just let them form their own opions about God and everything else because I was always told what to believe. And guess what they are both wonderful people. The funny thing is that a couple weks before I told them about Sean my sister was telling me how she and my parents thought my kids were the most respectful of all the grandchildren, there are 12 in all. Then my mother goes and says that she WAS proud of him. Well you can't be proud of someone without giving credit to the morals that make them the way they are. By that point Sean had been doing Army Reserve weekends for 6 months and that had alot to do with who he is now.
If your son was never baptized then they can't disassociate him. He may be a disapproved associate, but that means that your relatives can talk to him, but they may indivdually keep him marked, and be careful around him. That is my understanding. They cannot disfellowship you for supporting your son. (Well they can, but they will have a hard time defending that position.) You can always defend your position by saying that he wasn't baptized, he joined, and I support him in his decision because he is my son and I love him. They can't argue with that.
It sounds like you still want to talk to your relatives, so don't disassociate from the JWs. It means everything to them and you have nothing to gain by it. Don't play by their rules on this one. You may want to play by their rules on other things to keep from being disfellowshipped. What I mean by this is don't admit to Xmas, birthdays, anything like that. Only talk about your son. Tell them that you support your son. You support his decisions because he is your son. You never joined the military, so it isn't your decision. Use the link on passive resistance posted above. It gives you every advantage and puts an extreme burden of proof on them.
Good luck. I hope you can pull it off. We are always here to help you through this.
Tammy