For more on the Wertheimers and their family portraits see

http://jssgallery.org/Paintings/Wertheimer_Paintings/Betty_Wertheimer.htm

http://jssgallery.org/Essay/Wertheimer_Family/Wertheimer_Paintings.htm and

http://jssgallery.org/Thumbnails/Sargent_Paintings1898.htm

http://americanart.si.edu/search/results/?q=wertheimer

http://www.jstor.org/pss/860218