Notes:
Data researcher - Doug Mumma doug@mumma.org
I have no proof that George Hoover Mummaw is the son of George Washington Mumma but there is strong circumstantial evidence - This surname spelling is fairly unusual and exited in the west and east ends of Lancaster County.
1900 Census PA, Lancaster Co., west end of Paradise Twp.,
Rohrer, Isaac H., Head, Jan 1874, 26, m 0 yrs, b. PA/PA/PA, farmer
" Frances S., wife, Sep 1871, 29, m 0 yrs, 0 children, b: PA/PA/PA
Lefever, Lydia, neice, Mar 1888, 12, b: PA/PA/PA
Mumma, George H., Jan 1886, 14, b: PA/PA/PA works on farm
1910 Census PA, Lancaster Co., Lancaster City,
Mummaw, George H., 24, m1, 5 yrs, b: PA/PA/PA, occ: driving wagon, bakery
" , Mary E., 25, m1, 5 yrs, 2 children, 2 living b: PA/PA/PA
" , Clayton H., son, 4, b: PA/PA/PA
" , George W., son, 2, b: PA/PA/PA
1920 Census PA, Lancaster Co., Strasburg Twp.,
Rineer, Elmer K, head, 26, b: PA/PA/PA, Farm operator, general farm
" , Elizabeth M, wife, 26, b: PA/PA/PA
" , Helen, dau, 1 6/12, b: PA/PA/PA
Mummaw, Clayton, nephew, 15, b: PA/PA/PA
1920: Harrisburg Ward 4, Dauphin, Pennsylvania
Wilmer N Reed 39
Mary E Reed 43
Lee R Munnenaw 15
Clarence H Munnenaw 19