I`m sorry that you and your husband have/are going through this Barbara ,and as you are fully aware ,hundreds , if not thousands of others are going through this same crap.
My lovely daughter in law has, and is , still going through this from her parents and siblings for the past 15 years. As previous posters have said , if your son ever wakes up to the TATT , he will never forgive himself for the way he has treated you both , especially if either of you leave this world before hand.
As has happened many times over , his own children may disown the religion , and frankly I hope that will be the case. Maybe he will learn a bit of compassion then and regret the way he has treated you both.
Thanks for the post , & take care, the both of you.