This is purely a personal decision. Either way there's going to be hurt.
Outlaw nailed it for me!! Your kids are going to be the focus of "being saved" by your mother, and she will eventually ask if the kids can stay over some weekends, (guess what for!!) so I would lay down the terms and conditions as, "We come to visit you as a family, and we leave as a family".
If she can't accept such reasonable terms, then you will have to tell her that you will explain her Organizational command never to associate with you again, as long as you don't agree with what her Org teaches her!!
It's her choice.