“My son’s fiancée has turned all of our lives into some total [expletive]. It’s always some kind of drama,” says Cindy about her son Daniel’s future wife, Marissa.

TELL DR. PHIL YOUR STORY: Huge family drama?

Cindy and her daughter, Sarah, claim Cindy’s soon-to-be daughter-in-law is selfish, manipulative and a liar.

“Marissa is controlling my brother, manipulating his emotions so she can keep some reign over him,” says Sarah. “Daniel has expressed to my family many a times that he is not happy with her, that he wants to leave, that he doesn’t like her.”

WATCH: Why Mom And Sister Say They Have To Intervene In Son’s Relationship

The women also claim that Marissa has lied about pregnancies and miscarriages, in an effort to trap Daniel into staying in a relationship with her. And they claim she has become violent with Daniel, hitting him, carving into his skin and drawing vulgar images on his body. Marissa vehemently denies these allegations.

“She’s told my daughter and me, ‘I’ve punched him; I’ve set him straight,’” Cindy claims. “My greatest fear is that she might possibly kill my son.”

Hear more of their story in the video above. And on Monday's episode of Dr. Phil, see what happens when Cindy and Sarah face-off with Marissa on Dr. Phil's stage. Check here to see where you can watch.

TELL DR. PHIL YOUR STORY: Is Dr. Phil your only hope?

Woman Says Fiancé’s Family Is Destroying Their Relationship With Him