William and Alice were married on 22 July 1880 at her father's home in Friends Creek, Macon County, Illinois.

William and Alice Cooper had seven children:

1. Lola Amy Cooper (08 July 1881 - 20 January 1961)
2. James Robert "Maris" Cooper (15 August 1884 - December 1937)
3. Velma Lilly Cooper (22 August 1888 - 19 November 1969)
4. Ralph Emerson Cooper (07 June 1890 - 23 April 1908)
5. Flossie Fay Cooper (08 December 1893 - 25 October 1966)
6. Esther Della Cooper (26 March 1896 - 15 March 1985)
7. Nellie "Florence" Cooper (29 September 1897 - November 1979)

From the Obituary of Alice Ann Sellers Cooper, unknown newspaper in Champaign, Illinois:

"She was a member of the First Methodist Episcopal Church, Decatur, Illinois, and a charter member of the Oriental Rebekah Lodge of Argenta, Illinois."

From the Obituary of William Thomas Jefferson Cooper, unknown newspaper (probably in Decatur, Macon County, Illinois):

"William T. J. Cooper, county treasurer, died at 5:35 Monday morning at the family residence, 825 West North Street, (Decatur, Macon County, Illinois).

"Mr. Cooper contracted a severe cold during the Sunday revival meetings (Billy Sunday) and pneumonia developed. For two weeks, he hovered between life and death and then a change for the better was noted. He improved steadily, and it was thought that he would eventually recover, but while he was able to sit up a little each day, he never had his clothing on after he was first taken sick, and was never able to leave the house. His condition remained stationary for weeks. Finally uremic poisoning developed and that was the immediate cause of his death.

"Mr. Cooper was for years prominent in politics in Macon County. He served as collector of Friends Creek township and also represented that township on the Board of Supervisors for four years and was chairman of the board one term. Two years ago he was elected County Treasurer, which position he held at the time of his death. He was a man of sterling qualities and was held in the highest regard. Shortly after he was taken ill, and while his condition was still critical his son, Ralph, was stricken by the same disease and died. This was a severe blow to Mr. Cooper.

"W. T. J. Cooper was born in Macoupin County, Illinois in 1857, and in 1864, moved to Macon County with his father, James S. Cooper, who died seven years ago. He lived on the farm until he was 21 years of age. Later he taught school for a long time and about nineteen years ago he started in business for himself in Argenta (Macon County, Illinois) where he conducted a general store for a long time. He was also a member of the firm of Barber & Cooper, whose place of business is on Prairie Street, Decatur. Mr. Cooper maintained his residence in Argenta till a few years ago when he moved his family to Decatur.

"Mr. Cooper was a prominent member of the Odd Fellows. He belonged to the Decatur encampment, I.O.O.F, the Knights of Pythias, and the Modern Woodmen. He was converted during the Sunday revival meetings and it was his intention to have united with the First Baptist church, but he was taken ill before he had the opportunity, though he had signed the preference card."

"He was buried in Friends Creek Cemetery, Argenta, Macon County, Illinois."

	 Robert Y. Sellers - Amy M. Hadley
	 ---Lot Maris Hadley - Eunice Haydock
	    ---Jeremiah Hadley - Ruth Maris	 -----------		   
		   ---Jeremiah Hadley - Mary Dickey	---George Maris - Eleanor Lindley
		      ---Joshua Hadley - Patience Brown   ---Thomas Lindley - Ruth Hadley
			     ---Simon Hadley - Ruth Miller   ---Simon Hadley - Ruth Miller