I had to look him up too. In my husband's ancestry is a man who had 10 living children with three women. He was married to all three because the first two died after giving birth to two children. The third wife gave him six children. The births were spread out over 33 years and naturally these babies all arrived in days before effective contraception. He was a good father and adored by his family.
Thinking about Nick Cannon, since his relationships with the mothers is not sequential, I am unable to understand his morality. If he were a Muslim or a Mormon it would not be unusual. However, no Muslim or Mormon would pose for the photos with his pregnant wife so I assume he is simply behaving within the loose bounds of a morality that takes no notice of conventionality. It will be interesting to see what kind of father, husband and family man he is and will continue to be in the years it takes to raise the children.
I'm not very confident that he will be sufficient for the task.