I watched something about this a couple of days ago and whilst its clearly abuse not sure if i want to jump on the bandwagan of having the children removed.
It looks to be a case of **** just got out of hand and they have sleep walked into going too far after getting a bit of success chasing them views and likes.
Perhaps the backlash alone is enough for them to realise what they were doing was wrong and avoiding this genre with their kids altogether might rectify the situation as they might actually care for their children. Although their reply video appears like they haven't got the message.