When Catherine Bybee was born in June 1860, in Williamson, Texas, United States, her father, William Jefferson Bybee, was 24 and her mother, Phoebe Jane Jewell Bybee, was 23. She married William Martin Smith on 9 October 1877, in Erath, Texas, United States. They were the parents of at least 3 sons and 3 daughters. She lived in Axtell, McLennan, Texas, United States in 1920 and Justice Precinct 1, Coryell, Texas, United States in 1930. She died on 5 February 1943, in Leon Junction, Coryell, Texas, United States, at the age of 82.