Data source is the pamphlet, "Genealogy of One Branch of the Jacob Mumma Family", written by Ellen Landis Mumma in 1970.
Listed in the Brubacher Genealogy in America, 1884, p. 195
http://ia700303.us.archive.org/33/items/brubachergenealo1884brub/brubachergenealo1884brub.pdf
1840 Census, PA, Dauphin Co., Derry Twp., p. 200
Widow Muma, 1 male under 5, 1 male 5-9, 1 female under 5, 1 female 5-9, 1 female 15-20 (probable error in Widow Muma's age - should have been 20-30).
1850 Census, PA, Daupihin Co, Derry Twp., p. 133, 29 Aug 1850
Fanny Mumma, 41, b. PA
Elizabeth " , 19, b. PA
Fanny " , 13, b. PA
1860 Census, PA, Lancaster Co., Rapho Twp., p. 862
Samuel Erb, 34, farmer $5000 personal, b. PA
Elizabeth " , 28, b. PA
John " , 8, b. PA
Samuel " , 6, b. PA
Fanny " , 4, b. PA
Elizabeth " , 4/12, b. PA
John Erb, 20, farm laborer, b. PA
Fianna Walter, 16, domestic, b. PA
1870 Census, PA, Lancaster Co., Rapho Twp., 2 Aug 1870
Erb, Samuel, 44, farmer, $17,000 real estate, $4000 personal, b. PA
" , Lizzie, 39, K. House, b. PA
" , John 18, farm hand, b. PA
" , Lizzie, 11, b. PA
" , Henry, 7, b. PA
" , Mary, 5, b. PA
" , Alice, 3/12, b. PA b. FEB
1900: Manheim, Lancaster, Pennsylvania
Benjamin B Kauffman, head, Feb 1820, 71, m: 8 yrs, capitalist
Elizabeth H Kauffman, wife, 69, m: 8 yrs,