You do know a substantial amount of social care spending goes on working age disabled adults, and a smaller percentage on children.
If adults have never been able to work, then they have never been able to afford a house, they could sell for their care. Even so, with a life expectancy of maybe 50 more years of adulthood, what kind of house would they need to have, to pay for 50 years of care home fees?
Parents can’t sell their houses to pay for disabled children’s care, and statistically they are more likely to be living in poverty, than the average family.
The other part of social care spending is child protection. If children get taken into care, who pays for that - it’s not likely their parents could afford it?
Social care for the elderly is either paid for, by unpaid familial care (mainly women) or the state. It’s all very well saying working age adults can’t pay any more tax, but who can afford to be an unpaid carer? It’s like insurance - the risk is spread among everyone.