Kristin says she’s desperate for an intervention for her 18-year-old daughter, Sara, who is seven months pregnant and admits to smoking cigarettes and marijuana daily, and using cocaine and heroin. Kristin says she not only fears for Sara’s life but is terrified for the welfare of her unborn grandson -- and she doesn’t know what to do. Sara says she’s not worried about her drug use, because she has seen other expectant mothers do the same, and “their babies are fine.” She says she’s not an addict and insists she only makes bad choices when she’s around her 20-year-old sister, Sadie, who is also abusing drugs. The siblings claim they haven’t used any drugs in two weeks, except for marijuana. What will their drug tests reveal? And, Dr. Phil uncovers shocking details about their childhoods -- is there a family legacy that needs to be broken? Plus, will Sara realize the dangers her unborn child could be facing? Don’t miss this gripping two-part series.