Brittanie admits that she’s a heroin addict. The 24-year-old has detoxed numerous times but has never remained clean. Her identical twin sister, McKenzie, who has been sober for almost four years, and her fiancé, Chad, say that unless Brittanie stops using, she is not allowed at their upcoming wedding.

TELL DR. PHIL YOUR STORY: Huge family drama?

“I need everybody to realize that I need a reason to be clean,” Brittanie tells McKenzie and Chad on Thursday’s episode of Dr. Phil. “To kick me out of your lives, and then do it for what? I think we’re being a little harsh on everything I’ve been through and everything I’ve done.”

WATCH: Young Woman Says Twin Sister’s Fiancé Is Driving A Wedge Between Her And Her Sister

“We can’t give you a reason to want to live; you have to find that for yourself,” McKenzie tells her sister.

Watch more of their conversation in the video above. And, how does Brittanie respond when Dr. Phil questions her about her behavior? On Thursday, hear Dr. Phil’s advice for both young women. Check here to see where you can watch.

TELL DR. PHIL YOUR STORY: Life in crisis?

Man Calls Future Mother-In-Law An ‘Absentee Mom,’ Claims She Sabotages Daughter’s Sobriety