I think you are a bit delusional if you think you can control all this. I have had the same family life, chats, discussions over what makes a woman, biology aired in my household; one teen is very much in my way of thinking but accepting of others choices, the other weeps if we even discuss it due to my horrible transphobic ways.
Parents, and authority, are there to be rebelled against and there is a good dollop of luck about whether your children are suddenly pulled into changing sexuality, identity and so on.
Becoming trans is also strongly connected with neurodiversity, so that's not really a controllable thing.
I'm not saying don't encourage critical thinking, or keep them away from social media (be prepared though that this can't last into later teen years), just be realistic you might be great at all that and your child is upstairs plotting their name change. It's happened to so many great families I know, and I would also say the children I know who define themselves as non-binary, trans or bi now out number everyone else by about 17 so try not to see it as a personal failure of parenting, these kids are lovely too but their path is harder, no doubt.