“The whole family is in transition,” Ms. Austin told a local NPR member station on Monday for a piece titled “Growing up Transgender.”

Siblings Mason, 11, and Joshua, 13, also came out as transgender for the station’s story.

“It feels like you’re getting to live for the first time,” Mr. Harrott said for the Queen Creek interview. “And my children are getting to be who they’ve always wanted to be.”