So you could have a situation where say 3 sisters and a SIL agree to care for an elderly parent, each doing one or two days per week.
This assumes a family of at least 4 siblings, which is usually considered an abnormally large family in this country. Are you saying we should drastically increase our childbirth rates to allow for this?
It also makes "get on your bike" in a period of recession a bit difficult, doesn't it? So presumably more families would end up living off benefits: you can hardly split granny in four when jobs dry up in one end of the country.
The other issue is that most people in the UK do not go into care homes until they need very specialised care, either because of dementia or because of severe physical disability and by this time, your average English house is not dimensioned for their needs anyway. I live in a standard Edwardian semi and there is no way you could have got the hoist required to wipe my MILs bottom fitted into any of the rooms, nor a stairlift big enough for her body up the narrow staircase. She would have been confined to her bed, suffering increasingly from bedsores. Instead, her lovely nursing home not only allowed her to go to the toilet with some dignity, but also to go on excursions and sit in the garden.
If I had been caring at home for a parent with her condition, or with severe dementia, I could never have left them alone to pick up dc in an emergency or take them to a hospital appointment.
And this is before we consider what a lifetime of part-time work does for a woman's pension.