Just my humble opinion -
One of the most generous and loving acts you could extend to your mother is to stifle your impulse to reveal your realization of TTATT. While it would be gratifying (for you) on several levels, unless you have reason to believe that she may benefit personally from the information, it would put your mother in a very difficult spot.
It sounds as if you and your wife have a pretty successful fade going on. There are many who would love to have had it so easy. It might be wise to play that out indefinitely. Don't make your mom choose between you and the JWs. You might not like the outcome.