Send them my best wishes. Both my niblings are trans but it’s not something either of them understood or appreciated until nearer the end of high school. The youngest did great and is off to Uni this year. The eldest had quite a hard time. It’s great that your youngest is starting high school with an understanding of themselves, and also that the support structures many schools have are much better than they were just 6 years ago. Hoping that they have a great time.