LB,
if you formally DA yourselves, your wonderful (sarcastic) daughter in law will probably use that as leverage to separate you from your son.
You did say she was hardcore JW, right?
Are you sure which way your son will go as far as his treatment of you? Most likely both ways, trying to keep her happy and you happy, which means no one will be happy. It might go your way, and he'll be forced to make a decision for you and his mom and he'll break up with his wife. Or he may decide he has to cut you off entirely if his wife "lays down the law."
My brother would leave the WT tomorrow, but he's passive and his wife has him under her thumb. She's hardcore JW.
Perhaps you could share this thread with your wife and "count the costs" before taking action?
Best of luck to you, LB. Know it's not easy for you guys right now.
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"The truth will set you free--but first it will make you damn mad."
M. Scott Peck - "The Different Drum"