Watching my son become my daughter
Llyr grew up in Wales as a farmer's son in a close knit community and is transgender.
Aged 16, Llyr is one of 75 children and young adults to have been referred in 2016 to a specialist NHS clinic as a result of transgender feelings.
We spoke to Llyr's parents and asked them how they dealt with this transitioning process.
Sweet Sixteen: A Transgender Story is on iPlayer
Produced & Directed by Molly-Anna Woods; Video Editor: Helene Daouphars