Attached above as a downloadable PDF file is an article about the Dreiser family:
Carmel O’Neill Haley, “The Driesers,” The Commonweal, vol. XVIII, no. 10 (July 7, 1933), pg. 265-267
Ms. Haley knew Theodore Dreiser’s sister Maria Franziska Dreiser (1861-1944) – known by Ms. Haley as Mary and by the Dreiser family as Mame — and her husband Austin Daniel Brennan (1874-1928) well.
In the article, she provides brief reminiscences of Mame and her husband; Theodore’s Dreiser’s father and mother; Theodore and Mame’s brother Paul Dresser, the songwriter (1858-1906); and a “red-headed nephew” (not named here), Carl Dresser (1888-1915), who was the son of Theodore and Mame’s sister Cacilia (Sylvia) Dreiser.
— Roger W. Smith