Son carrying his mother because she is too frail to sit on a wheelchair.

And I wouldn't want to put that responsibility on my son.

Sadly, she probably has no idea what is even going on...

Well he is willing to do it. So he is a great son

There are people who are so weak, they'd fall out of it

Aren't there straps or whatever?

Yup. But maybe can't affordt it. It will be a special wheelchair

Also it seems to be an asian country (east asia). Culturally they have high respect for their eleders. So he might be ok with taking care of her