1.  LDS.  IGI (online):

George A. FLOOD Husband Age at Marriage: 19 Marriage: 25 Dec 1853, Trigg, Kentucky Spouse: Elizabeth D. THOMPSON Wife Age at Marriage: 22 Source: Births, Marriages, Deaths, 1852-1910, Trigg County (Kentucky)

2.  1850 Census Index/Microfilm (online at GenealogyLibrary.com):  District No. 2, Trigg Co., KY, p. 331, 65/65, enumerated 10 Aug 1850 (extracted by Diana Gale Matthiesen):

Miles Malone	33	M	farmer		Tennessee
Sarah A. Malone	33	F			"
[Miles & Sarah's children]
Elizabeth D. Thompson	17	F			Tennessee

Living seven doors down from Mary THOMPSON (also born in TN), who appears to be a widow and has four children.  My guess is that Elizabeth is Mary's daughter, working as a housekeeper for the MALONEs to survive and possibly to earn money to contribute to the support of her mother and siblings.  The fact that Mary THOMPSON has a son, Miles THOMPSON, suggests there may be a relationship to the MALONEs, especially as the MALONEs are also from Tennessee. 

3.  1860

4.  1870

5.  1880

6.  1890

7.  1900

8.  1910

9.  1920

10.  Barney Thompson. MS. The Thompson Family of Prince Edward County, Virginia, Butler and Trigg Counties, Kentucky, and the Florida Parishes of Louisiana:  the Descendants of Thomas Thompson, 1749-1810.  Copies at Western Kentucky University, the Filson Club Library, and the Indiana State Library, Indianapolis.  (Excerpts courtesy of the author, with my sincere thanks for his generosity in sharing them.)  On p. 26:

The following is George's obituary from the December 4, 1916, issue of the Paducah Evening Sun:

George A. Flood, 82 years old, a prominent farmer of near Massac, died Sunday night at 10:25 o'clock at his home of pneumonia.  The funeral was held at 3 o'clock this afternoon at Mt. Zion church, the Rev. Mr. Rouse officiating.  The deceased was born in Trigg county and moved to McCracken county in 1864.  He is survived by his wife, Mrs. Nancy Flood, and four children, by his first wife, as follows:  Mrs. Margaret Farmer and Mrs. Laura Farmer, of near Massac; Mrs. Sallie Hartsfield and Mr. A.J. Flood, of Oscar, Kentucky.