Ray, I agree, show them how to do research and yes the mother will probably amp up her devoutness. I would suggest not only teaching them critical thinking skills but also fill their lives up all that life has to offer! B-days, holidays, sleepovers with "worldly kids", sports, band, orchestra, student council or anything else that schools or communities have to offer. That has worked wonders for my children. They have so much to fill up their lives that they look at the jdub world now and IT is the odd world, not the other way around. Their mother is getting more and more strict but after they are exposed to what a normal life looks like they will never choose the jw world.
Good luck!
pbrow