Perhaps suggest doing research together as a "family study."
Research things like the destruction of Jerusalem, the authenticity of the biblical flood, etc. Don't just use Watchtower's publications, but use archeological and academic sources too.
Pick some topics where you know the society cherry picked quotes and facts, and look up the original sources to read the stuff in context.
When I told my wife about my doubts, I went too hard in trying to tell her TTATT stuff. In the end, what woke her up was her doing her own research and me sharing the PBS News story on the Candice Conti sex abuse scandal. It's very powerful for a JW to see the leaders of their organization lie under oath or try to justify not reporting child sexual abuse under oath.