According to the marriage record of Clark, and the birth record of Emma, Sarah's name is WALLISA.Living with Isaac/Sarah 1870...Mary 25, Robert 22 WALLIZER...possibly Sarah's siblings. Death records for Carrie ARNOLD, Emma MILLER, Lettie REYNOLDS, Ida RICE, Geo E HOFFMAN, Clark HOFFMAN available familysearch.org.
1870-80 Isaac [father b VA] & family reside Fairfield, Butler Co OH 1860 Isaac/Sarah, reside Clear Creek, Fairfield Co OH
1850 Clear Crk, Fairfield Co OH HUFFMAN Julias 62 VA; farmer Elizabeth 55 PA Jane 16 OH Isaac 15 OH***** Sarah 12 OH next door Samuel HUFFMAN 41 OH and family Julias/Eliz. both appear to be dec'd by 1860. A researcher indicates....10-20-1814 Julius HOFFMAN m Mary Elizabeth SMART, Fairfield Co OH
Clark's marriage record says he was b Ross Co OH, but I'm not finding your HOFFMAN/HUFFMAN family in this Co on any census.