 Denis met his future wife Ada in New York City.Ada was from a long established family, the Ketchums of Buffalo New York who helped establish the Buffalo and Erie area of New York before the Revolutionary War.Denis and Ada Charlton Brennan wed September 14, 1907 in New York City; the couple would have three children, daughter Muriel Denise (born August 1908), son Kearns (born August 1909) who died within hours of his birth and lastly, daughter Alice Eleanor (born December 1910).