The beauty thing is interesting, beauty is our way of assessing quickly if someone is a good mate (biologically). Good mates strengthen the species, by definition [assuming the system works, maybe it doesn't]. So, beauty of the children is an appeal to tribal instinct that it would be useful to society for this family to prosper.

I'm absolutely not saying I agree with this manner of assessing people; but it's interesting to imagine how it fits into development of the species and how that 'works' with society.