Charlotte and Dan say their daughter Christy’s drinking got so bad, they are now raising Christy’s daughters – and have been doing so for years.

“She doesn’t make them her priority,” Charlotte claims of Christy’s attitude toward her children.

Christy’s sister, Lori, claims the girls were repeatedly missing school, due to their mother.

“Because of the drinking, Christy was not getting them to school on a regular basis,” she contends.

WATCH: Parents Say They’re Fed Up With Daughter They Call A ‘Freeloading,’ ‘Alcoholic’

So, Charlotte and Dan say they stepped in.

“We called Christy and said we’re not bringing the children home until you get your act together. That conversation was three-and-a-half years ago – and we’ve had them ever since,” Charlotte explains.

Though Christy admits to having a drinking problem, she insists she’s not a bad mother and says she’s ready to take care of her children again.

WATCH: Mom Who Admits To Having A Drinking Problem: ‘My Family Refuses To Understand My Struggles’

“When my parents took my children, without any warning, I found out over the phone,” Christy says. “I definitely do want my children back with me, but I feel like my parents and my sister have tried to drill in their brains that I’m a piece of crap mother.”

Watch the video above, as Charlotte also claims Christy has only seen her daughters twice in the past three months, and explains how she claims she uses the kids as leverage to get her parents to pay for things for her.

This episode of Dr. Phil airs Monday.