I'm going to try hard from a young age to get my children interested in science, evolution and archaeology as well and when they're older they'll be doing philosophy at school which should help. Thankfully they live with me and not the jw father so I'll hopefully have the strongest influence.
The atheists book of bible stories is another great book to use once old enough. It's questions to get their thinking really going though that i need to think of so they see through what dad says about Jehovah and jws.