A Texas father lost custody of his son this week because he did not agree that his 7-year-old son, James, should undergo a social and physical transition to become a girl.

Jeffrey Younger petitioned a court for sole custody of his twin sons after his wife, Anne Georgulas, began consulting doctors about treating James, who now refers to himself as “Luna,” with hormone replacement therapy. James’ age makes him impressionable, Younger’s lawyers argued, and his mother should not have the right to alter his life irreversibly simply because he enjoys playing with feminine toys and wearing dresses.