And is it so different from loads of other countries, where all the families are very close, with Grandparents living with the families, or in the same area, mixing on a frequent basis?
I have experience of far eastern customs and cultures, notably Vietnam, Cambodia, Laos, Thailand and The Philippines.
The culture of families living close together is very similar, BUT,
Vietnam - 5 deaths from Covid, 100,000,000 population, .
Cambodia - no deaths from Covid, population 16,000,000.
Laos - 0 deaths from Covid,
Philipines 2,000 deaths, population 110,000,000
So obviously the culture of families living close together does not appear to be a factor.