They've never heard me speak against the JWs. However, I do spend alot of time watching science shows, listening to science podcasts, etc. I DVR all of the Wonders of the Solar System and Through the Wormholes and watch them over and over. Not because I want to see them, but I am hoping some child wandering by will take notice. I also take the time to ask them "How did this happen?" questions about the origin of the sun, solar system, Earth, etc. I don't directly deny that a god had anything to do with it, but that never enters into the conversation.
Just Tuesday night we were talking about accretion disks, water ice in the solar system, etc. I do this with my older sons as well, but they are so preoccupied with their teen and pre-teen lives and video games and eating that they barely pay me any attention at all.
I try to stay away from programs that are heavy on evolution so as not to trigger a response from the wife. She's usually in the room, but this stuff usually just goes right over her head unnoticed. If she hears the word "evolution" too many times, though, it's a warning. I have shown her (my wife), however, that the Watchtower no longer directly opposes a "big bang" but that they attribut the "first cause" to Jehovah. In other words, they allow for there to have been a huge explosion which ultimately coalesced into galaxies, suns, and planets. The Watchtower falls off of the science wagon when it comes to the creation of the living species of Earth.
But I digress. I don't know where any of this is going and maybe she won't ask me again for a while. It's precisely for these reasons that I don't dare say anything about my beliefs because I love being with my kids every day. I love my wife, too, but I think I could deal with a split from her easier than I could a separation from my kids.