I believe it would be considered odd if a member of the DRF was a burden to a hospital system in foreign country - not least in the middle of an epidemic.
Don't understand...? The family lives in France. They intend to live there for several years, maybe even for the rest of his life. Why would it be odd to be treated where he lives? He lives in Paris and it would be only natural to move him to a hospital there, if necessary.
It would be more odd to be treated in a completely foreign country, like, say Greece or the US after something had happened during a holiday or something.