Interesting story, yes gays have been around forever and I can’t know the cause in all cases. Still, I don’t think it’s wise to just accept or encourage a kid to switch genders at a young age. Then again fighting against it may do harm as well.
Anyone wanting to know about the causes of homosexuality should read this link - has a lot of info plus more at the links there. If the boy who was interested in girly stuff had had counseling, he probably would not have become homosexual. Sometimes boys just are interested in non-tradition things, same with girls - some are “tomboys”. But that doesn’t mean they’ll become homosexuals; but in our culture, kids who don’t fit the “boys like sports and cars” and “girls like dolls and fashion” norms are often steered into homosexuality by others. Or taken advantage of by older homosexuals, and made fun of, etc.
Homosexual researchers have looked and looked and looked and looked for biological evidence that people are born gay and they have not been able to find any. None at all. Tons of info on the thread and links.