What should happen to these parents?

I do apologize in advance for this most horrific story, I would suggest not going to the link as it has some graphic details….but I had to ask this question on what should happen to these parents who left their infant unattended and 3 pet ferrets chewed off most of the babies face. I am utterly mortified by this story and at a loss of words on what should happen to these parents who allowed this to happen. The father further revealed his lack of any sense by saying “It’s not our fault. We didn’t do it, the animals did it,”