Stephanie, who recently found out that her mom and brother are using heroin together, says she's "disgusted" with them -- especially her mom who used to watch Stephanie's 4- and 8-year-old kids until Stephanie found out about her drug use.

WATCH: What Life Is Like For Heroin-Addicted Grandma Who Gets High With Her Son
"I always tell her it's not normal, but I know people who smoked pot with their kids," says Stephanie's mom, Kathy. "I don't do heroin around them. I don't want her to take the kids away from me."

Watch the video above as Dr. Phil looks at Kathy's excuses for using heroin, and Stephanie confronts her mom. Will Kathy and her son get the help they need? Tune in to Monday's episode of Dr. Phil.