Comtesse de Loriol Chandieu's son would marry the daughter of the Mrs. Huth Jackson from Scotland, according to the Comtesse's grandson, Peter de Loriol. Mrs Huth Jackson was painted by John Singer Sargent (Helleu's best friend.)
I asked Peter, given the name of his grandmother, if his Grandfather and father were French.
From: Peter de Loriol
I grew up in France only because my mother worked for Unesco, but my Anglo-Swiss grandmother died sometime before I was born.
All the best