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.
“Children can take lessons in that school via the Internet and can score extra points like e.g. in Geography or History. That sounds very promising and is a fantastic basis for future steps.”