Because GM won’t publish the sensible replies from me, here’s what I posted in reply.
My advice to the parents would be to love your child regardless, my advice to their child would be research, research, research. If you head down the path of transition, make very sure ths it’s the right path for you. If you’re not 100% certain then don’t do anything, research more to find who you are. As someone who is trans, it’s not something I’d wish on anyone, it’s a lonely road full of hazards along the way, and very little option to turn away from if its the wrong road for you.