The estranged husband of Ruby Franke -- a mom who rose to fame on YouTube and later pleaded guilty to child abuse -- is now speaking out to warn other families about the dangers of social media.

Ruby Franke's daughters, 16 and 11, shared statements condemning the controversial parenting YouTuber, who is serving prison time for child abuse.

"I feel like my mom used me for money," the preteen said in a letter read by her dad during a recent hearing