Gender identity is fluid and the research in psychology is clear on this.
Biological sex is even sort of fluid, what with hermaphroditism and such.
I know that sex and gender are some of the last remaining comfortable “truisms” in society but that’s just not the case. Things are complicated. Let’s not punish families for something that’s totally normal.
The vast majority of people identify with the biological sex they were born with. Fluid suggests someone can switch back and forth as they like.
But this is America. If a guy wants to dress up like a woman and call himself a woman that's his business. But let's keep these matters in private. Keep it out of schools. Let adults decide these things. Leave kids alone. No drag queen shows for students. No discussing sexuality in classrooms. No forcing people to use "correct" pronouns. Stop trying to force all of this on the rest of society. Do your own thing without demanding others to accept it or else.
I don't want to see anyone get hurt over this stuff. I don't want anyone physically attacking others because they don't like what is happening. But pushing people to accept it, threatening to take away kids from parents who don't, threatening to take away livelihoods, is likely to result in physical attacks as people get angry and frustrated and backlash. Live your life as you see fit but know some boundaries. There are people who want to kill you over these things. Poking them in the eye won't turn out well for you.