I know it probably varies hugely.
Dh's grandad died last week. Him and his DW had 6 dc between them (blended family). They had carers coming in 3 times a day, a cleaner and someone bringing round dinner every day but inlaws were still going down there every day for 4 hours (their other dc were taking it in turns to come as well) and cooking, cleaning, doing personal care etc. MIL said they still need to come down every day this week to supervise the removal of all the medical equipment and to help clear the house etc.
Before all this I assumed that the carers would come in and do what was needed and if you needed more care than that you go into a hospice/hospital or nursing home. Of course you would still visit your elderly relative but no need to do the work of caring.
Now i am getting worried. Inlaws are currently mid to late sixties so we have a while to go yet hopefully. But dh is one of 2 children and we have dc with disabilities who are likely to need us a lot until we die (and after that, goodness knows what will happen then). I know it's stupid to worry about stuff this far in advance but i am wondering how on earth we will manage to look after inlaws as well as care for 2 disabled adult children when we are getting older ourselves.
Hoping someone can tell me that having care needs to that extent is rare and in 15-20 years time there will be free robot carers for everyone who wants one.