At certain historic moments, grandparents took on childrearing responsibilities. In many cultures, they still do. Chinese grandparents who are able to retire at 55 are seen all over Beijing bouncing grandbabies. In the United States, we can't afford to retire at 55.
By the general process of epic poetry, I mean the way this form of art has constantly responded to the profound needs of the society in which it was made.
You can dress it up, but it comes down to the fact that a movie is only as good as its script.

