1900 Census, Lee Dist., Calhoun Co., WV
Marks, Thomas G., b. Nov. 1867, 32, married 7 years, b. WV, parents b. WV, farmer
Alice M., wife, b. Aug. 1874, 25, married 7 years, 4 children/4 survive, b. WV, parents b. WV
William E., son, b. Feb. 1894, 6, b. WV
Halland R., son, b. Dec. 1895, 4, b. WV
Mary B., dau., b. Dec. 1897, 2, b. WV
Daniel W., son, b. Apr. 1900, 1 month, b. WV
McCullough, Daniel G., father-in-law, b. Sept. 1830, 69, married 45 years, b. PA, parents b. PA, farmer
Mary, mother-in-law, b. Oct. 1833, 66, married 45 years, 1 child, none survives, b. WV, parents b. WV
**Note: Daniel and Mary were grandparents-in-law, not parents-in-law

1910 Census, Spencer Dist., Roane Co., WV
Marks, Thomas G., 43, married twice, married 2 years, b. WV, parents b. WV, farmer, general farm
Mary Jane, wife, 49, married twice, married 2 years, 2 children/2 survive, b. WV, parents b. WV (children must be older and from first marriage)
William, son, 16, b. WV
Randolph H., son, 14, b. WV
Mary Belle, dau., 12, b. WV
Daniel Wilbert, son, 10, b. WV
Emerson Dorsa, son, 7, b. WV
McCullough, Mary, grandmother (-in-law), 76, widowed, 4 children/2 survive, b. WV, parents b. WV