I found Nellie.
1880 Tipton, Cedar Iowa page 125D
Soloman Cripliver, carpenter, self, male, married, white, age 33, OH OH OH
Barbara, wife, 28, NJ GER GER
Viola, dau, 5, IA OH NJ
Moss, dau, 4, IA OH NJ
Lily, dau, 9M, IA OH NJ
Clara N. Rockhaltz, boarding, SisterL, 14, IA GER GER
Decided to check out 1900 census too.It paid off.
1900, Tipton, Center Twp., Cedar Co. IA, enum. dist. 24, sheet 9A
Edward, Noah J. born 1871, 29, married 9 yrs., IA IA IA, carpenter
Clara, 1866, 33, 3 children with 3 living, IA GER GER
Winifred, 1892, 7, IA IA IA
Vera,1894, 5, IA IA IA
Marvel, 1895, 4, IA IA IA
I re-checked the 1920 census prior to the above search.It reads Germany for both parents with German as their language.
It looks like Barbara was a sister of Nellie.She said she was born in New Jersey.Looks like a search in that area might be necessary.I think Cedar County records might give you the info. you seek regarding the parents of the girls.If only the 1870 census was easy to search.I didnot check to see if that census is on line with an index.Given time I guess I could do a page by page search.