Notes:
Peter and Mary divorce prior to the 1910 census.
1910: Columbia Ward 9, Lancaster, Pennsylvania
Mary H Mummaw, head, 43, divorced, 2 children, 2 living, keeper, boarding house
Henretta Mummaw, dau, 22, single, cook in home
+ 15 boarders
1920: Columbia Ward 9, Lancaster, Pennsylvania
Street: Plane and Franklin
Mary Mummaw 55, widowed, keeper boarding house
Henrietta Mummaw, grand dau, 9
Mary Mummaw, grand dau,14
+ 5 boarders
1940: Columbia, Lancaster, Pennsylvania
Street: 110 South Third Street
Mary H Mumma, head, 75, married, boarding private home
+ 4 boarders