Welcome to the forum.
ALL our family said they would shun us for the rest of their life, no matter what. Even if we have kids in the future ...
... they want us to just be inactive so they can keep talking to us.
They wish to blame you for their actions instead of accepting responsibility for their own choices.
No one is holding a gun to their heads to force them to shun you, but they gladly comply with the dictates of a cult run by men. For a group that claims to be bible based, the most loving and the chosen people of the 'god of love', it does not take much for them to ignore Jesus examples. They quickly discard family relationships if they are told by men that they 'may be' (not assured) rewarded for doing so.
We haven't done our research.
They have not done their research, but they are only reaffirming their belief that the cult they are members of, could never do such things. As they are too afraid to research for themselves, they accuse any one that states info that is negative or contrary cult teachings, to have fallen for false stories and half truths that have no basis in fact.
I recall a scripture that states to keep making sure of all things and hold onto that which is fine (proven), but JWs commonly ignore that scripture.
While your families accuse you of breaking your vows, were any of them members of other religions before becoming JWs? If so, did they not break their vows to God?
While there is no one course of action that is suitable for everyone, most PIMO and inactive (ex-)JWs remain such to maintain relationships with their families who may not know their true status. As your opinions are now known to your families, there should be no fear that your families will learn of your life choices so that may lessen your fear (looking over your shoulder) in just remaining inactive.