Here's my 2¢ worth. Just something I would consider saying...
You ask us to respect your right to believe and live as you think best. We do and we will, even though we do not share those beliefs. We ask the same from you. Anything less would be hypocrisy.
You may remember that the July 2009 Awake! said, "No one should be forced to worship in a way that he finds unacceptable or be made to choose between his beliefs and his family." Did the Governing Body mean what they said, or were they institutionalizing hypocrisy?
We understand and accept that you do not agree with the way we now see certain things, but that doesn't mean we're not still family. Why can't we set aside this divisive issue, and simply love each other the way we should? We will gladly agree not to criticize the organization or your beliefs, and in return we ask that you acknowledge our right as adults to have our own beliefs. Any discussion of religion can simply be off the table. Would that work for you?
I don't really think such a reasonable approach will work. I mentioned that Awake! article to my very PIMI sister, and she practically shouted, "THAT DOESN'T APPLY TO US!!! WE HAVE THE TRUTH!!!'
On another occasion, when she and her husband made clear that they would be shunning me from then on, I told them that no matter how badly they treated me, they would always be welcome in my heart and in my home. Her response? A very accusatory, "You're just trying to be magnanimous!" Sheesh! In the voice of Steve Martin, "Well excuuussse me!"
Since then, I've made it clear that social coercion and emotional blackmail will not work on me. In fact, they have the opposite effect. Whenever we do have contact, I remind her that my heart and my home remain open to them. No response...
Anyway, I know how you feel and where you're coming from. Good luck. I hope that one day our loved ones will realize just how hypocritical their position is and what a bad "witness" they are giving when they cruelly shun family whose only crime is leaving the religion.