Theodore Ernst Mumme was the third child born to Carl Theodore Mumme and Elise Ernst. He was born January 8, 1865. He married Roberta Erwin who was born November 26, 1867. He operated a grocery store at 1502 S. Flores Street in San Antonio, Texas, and also functioned as a cotton buyer and merchant.
There is no record of any children born to Theodore and Roberta. Theodore died February 24, 1948, and Roberta died February 12, 1950.