Gary says he was devastated when he found out that his son Zach is transgender and wants to transition to biologically become a woman. "I just feel like I lost him, like he's gone," says Gary, who is biologically Zach's uncle but has raised him since he was 2 days old and considers him a son. "I don't know how to take him as a girl. It just seems like I failed." Watch more of how Gary initially reacted to his child's news here. 

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Gary has seen photos of Zach as dressed as a Steph, but he has never seen the son he raised in person as a woman. Watch as he struggles to face Steph for the first time. This episode of Dr. Phil airs Friday.