Theodore Pierpont Barnum, married in Troy, Rensselaer County, NY, April 18, 1900, Antoinette Spencer Alden, daughter of Charles L. Alden and Mary Langford Taylor. She was born in Troy, NY, May 29, 1871. (Pierpont Genealogy) They had one daughter: Mary Alden Barnum, born in Troy, NY December 31, 1905.
From the Times Record, Troy, NY, May 28, 1959: Theodore Pierpont Barnum, 85, president of the Barnum Electrical Co., Troy, for the last 60 years and a member of many engineering societies, died today at the residence of his daughter Mrs. Philip Hogan, Marblehead, Mass. where he was visiting.
A lifelong resident of Troy, he had resided at the Hotel Troy. He was a member of the First Presbyterian Church, Troy and was a graduate of Troy High School and Troy Academy. He was the husband of the late Antoinette Alden and son of the late Theodore F. and Mary Pierpont Barnum. Surviving besides his daughter are two brothers John Pierpont Barnum of Brookline, Mass. and David Barnum of Florida and two grandchildren.