Margaret Rutherford married the American politician and diplomat Henry White, who was posted to London from 1884-1893. They had a son, John Campbell White (1884-1967), who was born in London on 17 March 1884.
Her portrait, painted by J. S. Sargent in 1883, is in the Corcoran Gallery of Art in Washington DC.
www.jssgallery.org/Paintings/Mrs_Henry_White (accessed 2005); Kilmurray, Elaine and Richard Ormond (eds.), John Singer Sargent, Princeton, 1998.