I think many are in your position Oub, which must be a little like being a "sleeper" that the Secret services of the West sent in to Communist Bloc countries, unable to express their true thoughts, feelings and loyalties. Not easy.
The parallel between the WT and Totalitarian regimes is a powerful one, so be careful my friend !
A friend of mine got in to a bit of trouble, he was and is an active believing JW, but had spoken his mind at home, and his views were outed at a meeting by his young daughter, aged about three, she loudly said "This is soooo boring, we've heard it all before".
Be as cautious as a dove.
As I said above, if one's motive is laudable, then staying in is necessary, but there are a few who simply fear the loss of family so much they are afraid to be honest. If I was going to lose my kids by leaving, I would still be in, but the rest of the family, Mom, Dad , siblings, if they cannot respect my right to think and believe as I want, then I did/do not mind losing them, they are mind-controlled cult drones, not really my family.
As it happens, my experience has been, and that of others on here, that I have not been cut off by family, just "distanced". Mind you, I have been careful not to be Df'd or DA'd.
But until you take the walk away from the cult, you do not know what will happen in many instances.