Ok, we live in rural France. Property here does look cheap compared to the uk , but the cost of living? From what I can gather grocery prices are cheaper in Spain as well as fuel prices. France currently is cold and wet and windy , winter is much more wintery than Spain!
Since Brexit you need to have income of more than the minimum wage per person to move here, about €1850 pcm. They will also need to pass a test in French language to A2 level (not right away but when they renew their visa). They probably don’t realise that their Spanish residency card issued under the withdrawal agreement only applies to Spain. French bureaucracy is mind numbingly complex -it’s almost an art form!
So let’s say they have the money, and can pay for help with the visa and with everything else paperwork.
Driving: there isn’t much in the way of public transport and Ubers are not a thing outside the towns.
Community: there are areas with big expat communities, but the property is more expensive. “Dordognshire” for example.
Inheritance laws are different- very different!
Parts of France are a medical desert - healthcare overall is very good, but finding a GP can be very challenging. Our local area now has a traveling clinic in a van which arrives about once a fortnight for booked appointments. It’s 35km to the nearest a&6 too and the major specialty hospitals are 50km away.
We love where we live - I’ve tried to point out the bad parts. Will we still be here when we are 80? Probably not- neither of us want to be on our own here, away from family, possibly needing care in a country where we don’t speak the language to a high standard.