When Sharon’s son, Gabe, was 16 months old, he battled stage 4 cancer -- and Sharon says it changed her son. 

TELL DR. PHIL YOUR STORY: Teen in crisis?

“I sometimes feel that when he went through his treatment, the chemo took a piece of his soul,” Sharon says. “It was like a switch flipped. He was angry, became very aggressive, verbally, physically. He was not himself.”

WATCH: Why Dad Says That He Fears 15-Year-Old Son Is Going to End Up Shot Or In Prison
 
Now 15 and in remission, Sharon says the teen is a wannabe gangster who hangs out with “homies,” uses drugs, has gotten into fights, and has spent time in juvenile hall. She says she and her husband, Jason, disagree on how to parent Gabe. “I feel like Jason contributes very little energy to the family,” Sharon says. “We need answers. We need solutions. We need a way to try to save Gabe because we just don’t know what to do with him.”
 

In the video above from Monday’s episode of Dr. Phil, hear why Sharon’s best friend, Rosalie, says she doesn’t believe Gabe’s illness is to blame for his behavior -- it’s Sharon and Jason's parenting.
 
On Monday, hear what Gabe says about his behavior, and find out if he thinks he needs to change. Check here to see where you can watch.