Between the 1880 and 1900 censuses, Margaret Livingston had died in 1893, and Laura Althea Thompson had died in 1899. In 1900, Archibald was living with Jane Park and their son Reuben in West Jordan. Serena was living in Spanish Fork, Utah with her children, and Mary Larsen was in Afton, Wyoming with her children. Following is the census image for Archibald. (1900 U.S. Census of West Jordan, Salt Lake, Utah, ED #67, p. 223, sheet 9A)
The next image is for Serena's census entry. She was living with her son, so her surname was listed as Evenson. (1900 U.S. Census of Spanish Fork, Utah, Utah, ED #166, p. 288, sheet 17B)
The last image is the listing for Mary Larsen and her family. Notice that her mother, Sena Heiselt, was living with her. (1900 U.S. Census of Star Valley, Uinta, Wyoming, ED #64, p. 207, sheet 8B)