Mystery Hearns living near Samuel Kenney

In the 1880 census, there are two Hearn families living near Samuel Kenney, father of Samuel L. Kenney.

I've gone over the information in Hearne's book, and I can't place them. Do you know who they are?

Family 684
Wm S Hearn, W, M, 46, Carpenter, Delaware, Delaware, Delaware;
Julia Hearn, W, F, 45, wife, at home, Delaware, Delaware, Delaware;
Nancy Y Hearn, W, F, 19, dau, at home, Delaware, Delaware, Delaware;
Rosa Hearn, W, F, 17, day, at home, Delaware, Delaware, Delaware;

Family 685
T Hearn, W, M, 43, Farming, Delaware, Delaware, Delaware;
Annie Hearn, W, F, 17, Keeping house, Delaware, Delaware, Delaware;
E G Hearn, W, M, 10, Farming, Delaware, Delaware, Delaware;
Census 1880, Delaware, Sussex, Little Creek District 54