Another thing is, that children in my culture do not feel "beholden" to their parents. The general view is that parents are supposed to take care of their children. And helping each other or spending time with each other is not a "duty", it is something one does because one wants to.

Generally children are brought up to be independent, to make their own decisions.
If they WANT help, it will be given. Still, it is up to the children, especially when they are adults, to take it or not. Nobody is forced or coerced.