Lucy Olmstead 66, born NY Samuel B. 28, born MN Emily W. 21, born MN
1870 census, Burnet Co., TX:
S. B. Olmsted 57, born NY Lucy A. 56, born NY Baldwin 19, born MN Lucy 13, born MN Emily 11, born MN
1860 census, Crow Living, MN:
S. B. Olmsted 48, born NY Lucy 45, born NY Esther A. 16, born IA S. B. 9, born MN Lucy Ann 4, born MN Emma W. 1 born MN
1850 census, Benton Co., MN:
S. B. Olmsted 37, born NY Lucy 36, born NY Lafayette 17, born PA Clarissa 12, born IA Esther 6, born IA
Some of these records you can look at for free at labs.familysearch.org and Ancestry.com. For those you cannot see for free I suggest checking with your local libraries to see if they have Ancestry or Heritage Quest.
I did not find Etta in the census. It may have been a nickname for Esther.