Caitlin and Jennifer claim their sister, Rebecca, is a liar, a thief, and is dependent on prescription drugs. They claim Rebecca’s choices have led her to live in a van, steal from their sick mother, and lose custody of her 8-year-old daughter with special needs. “When Rebecca takes a drug test, it lights up like a Christmas tree,” says Caitlin.

Jennifer says, “Her addiction affects the entire family.”

Rebecca adamantly denies her sisters’ claims and insists she doesn’t have a problem with drugs. Why does she claim she’s being “railroaded” by Child Protective Services?

This episode of Dr. Phil, “My Sisters Are Wrong. I Am Not a Drug Addict,” airs Friday. Check your local listing for airtimes.

WATCH: Woman’s Family Claims She’s Drug Dependent. She Insists She Only Takes What Her Doctors Prescribe

TELL DR. PHIL YOUR STORY:In a dispute with a loved one?