As long as their safe and self-aware about their decisions I'll accept them
if they're Gay, Lesbian or Bi I'll be fine with that
with being Trans though, I'll ask or talk to them about why exactly they feel that way, if it's them experimenting with androgyny, having body image issues or whether they are experiencing some early signs of Gender Dysphoria. (so they don't end up "de-transitioning" as some have done)
They'd have to be in about their mid-teens though, any other actions taken about it will happen in their later adult years
I'll get them to a good psychologist so they can learn more about what's causing it and how they can manage it, if they think about going on testosterone or something, I'll tell them to be aware of the side effects those medications and procedures can do to them.
I would also warn them about being safe when going out late at night, to clubs or going on dates, considering the risks of drugs and other problems, and the fact that a lot of trans people get attacked or murdered
other than that my opinion on them won't change, I will still love them