When Mimi and Joe Lemay’s baby was born in 2010, they heard the three words every parent waits to hear: “It’s a girl.” But by age two, their child was saying “I’m a boy.” Mimi hoped this “obsession with being a boy would go away,” but it only grew stronger. Now, in a rare and candid interview, they share in their own words why they decided to let their five-year-old transgender son Jacob transition and live publicly as a boy.