Identity:
Charles Donald Whistler was the son of George Washington and Anna Matilda Whistler, and was JW's brother. He died at an early age, en route to Russia.
Bibliography:
Mumford, Elizabeth, Whistler's Mother: the Life of Anna McNeill Whistler, Boston, (Mass.), 1939; McDiarmid, Kate R., Whistler's Mother: Her Life, Letters and Journal, [n.p.], [n.d.].