Clark, Frances, 53, England Walen, Nancy, 73 abt 1797, Va Walen, James A, 20, Ohio Walen, Martha, 18, Ohio
Nancy there is Francis' mother, as the 1880 will prove. Martha is Frances' daughter by William Ignatius Clark(e); William was alive in 1860 and gone, probably dead, by 1870.
I thought at first James was a grandson to Nancy, come along with her to help the women folks with the heavy lifting, and the enumerator forgot to change the surname back to "Clark". But,
1880, Hocking Twp, Fairfield, Ohio
Clark, Frances, 63, Head, Widowed, Va, Maryl, Maryl Waln, Nancy, 83, Mother, Widowed, Va, Maryl, Maryl Waln, Martha, 28, Dau, Single, Ohio, Va, Va
Martha is still a Waln in 1880, so, it looks like she married a cousin about 1869, (that was common in the 1800's) he divorced or deserted her, she claimed to be single in 1880 (that was also common in 1800's.)
The Waln surname looks like a typo, but isn't. It gets spelled "Walen" about a third of the time. The Clarks use Clarke and Clark as their whimsey takes them.
I can't find James in 1860 or 1880. Can anyone shed some light on the problem?