Margaret and Samuel lived in Iowa.73 They moved there sometime after 1867, when daughter Barbara was born in Pennsylvania.

1880 Census, Black Oak, Mahaska Co., Iowa, p. 282B229
Nelson, Samuel, 45, b. PA, father b. VA, mother b. PA, farmer
Margaret, 45, b. PA, parents b. PA, keeping house
William, son, 22, b. PA, farmer
Leonora, dau., 20, b. PA, at home
Caroline, dau., 18, b. PA, at home
Mary, dau., 16, b. PA, at home
Barbara, dau., 13, b. PA, at home