Thomas and Malinda were second cousins on the DeHart side.

1870 census of Patrick Co., Virginia,, Smiths River district, enumerated 15 Sep, lists on p. 52 as family #385/408:
Dehart, Thos J., 25, farmer; Malinda, 19; Mintoria E., 4; Mary E., 1. All born in Virginia.

1880 census of Patrick Co., Virginia, Smiths River district, enumerated 9 July, lists on p. 48 as family #440:
Dehart, Thomas J., 35, farmer; Malinda, 30, wife; Mintana E., 13, dau; Mary E., 11, dau; William G., 9, son; Permelia A., 7, dau; Lanar (?) A., 5, dau. All born Va Va Va.

The name that looks like Lanar may be Sarah - all the “Son” entries in the relationship column look like “Lou”. But more likely it is the daughter who is listed as Laura A. age 19 in 1900 and 33 in 1910.

1900 census of Floyd Co., Virginia, Burks Fork district, enumerated 22 June, lists on pp. 11A-11B as family #185/187:
Dehart, Thomas J., 56, b. Apr 1844, farmer; Malinda, wife, 40, b. July 1849; married 33 years, mother of 8 children, 6 living; Laura A., dau, 19, b. Feb 1881; Flora C., dau, 11, b. June 1888. All born Va Va Va.

1910 census of Floyd Co., Virginia, Burks Fork district, enumerated 29 April, lists on p. 7A as family #108:
Dehart, Thomas J., 66, widowed, farmer; Laura A., dau, 33, single; Flora C., dau, 21. All born Va Va Va.

1920 census of Floyd Co., Virginia, Burks Fork district, enumerated 7 Jan, lists on p. 4A as family #50/51:
Dehart, Thomas J., 74, widowed, farmer; Laura A., dau, 40, single; Flora C., dau, 30, single. All born Va Va Va.

The next household is that of William G. Dehart and wife Nettie.