Maurice Chevalier would be so disappointed.

I *really* don't want to sit in judgement upon a culture about which I am largely ignorant, but this preference seems alarmingly short-sighted. On a biological level, it doesn't make much long-term sense. Let's say that parents depend on their son(s) to provide for them in their old age--is it crazy to imagine that their daughter-in-law would be a critical component in their care? How, precisely, do bachelor sons care for elderly parents.

I'd love to be enlightened on this issue. Can anyone help me understand this?