Beatrice Winans (Comtesse de Béarn) (1884-1907), was the daughter of Ross Revillon Winans and Neva Whistler (Whistler's niece).
She married Henri Louis Elie Joseph de Galard de Béarn (1874-1947), Comte de Brassac.
Her sister, Marie Julie Pamphile Berthe de Béhague, Comtesse de Ganay (1868-1940), wife of Charles Alexandre Anne Jean de Ganay, Comte de Ganay (1861-1948), was a collector, and their son, Octave Marie Hubert de Ganay, Marquis de Ganay (1888-1974) inherited a painting that may be by Whistler , Head of a Peasant Woman (YMSM 21).
Genealogy for Beatrice Winans (1884 - 1907) family tree on Geni.
Gibson and Shields Families of Baltimore, MD, website.
'Beatrice Winans', Ancestry.com.