In France relatives are expected to contribute to a parent's care. A dd has a French colleague who is expected to pay a substantial sum each month - which she really struggles to afford - towards her father's care.
Here, AFAIK, if the person's assets are not enough to pay for their care, relatives cannot be required to pay top ups. If social services have deemed that the person needs residential care, it's up to them to find a suitable placement.
However, with fees endlessly rising, and more care homes closing, it is presumably often very difficult to find anywhere both affordable, and with a room available.
We have had 3 self funders in this family, all with dementia, and all their houses had to be sold. Personally I had no objection to this, and from all I've read and heard over many years it was a great 'blessing' that we could choose the time and place, and did not need to be dependent on social workers, who (understandably, given the cost) are so often anxious to avoid care home placements as long as they possibly can, even when relatives doing their best to care are on their knees with stress and exhaustion.