William was listed as four years old on the 1850 Madison Co. AR Census with his father and his siblings. His mother had died earlier in the year.
He was also listed on the 1860 Lamar Co.TX Census with his father and stepmother, along with his brother Hiram Harvey and his sisters, Ellen and Lydia.
William is listed on the 1870 Washington Co. AR Census with his wife Etheldra. They were married in April of that year in Washington Co. AR. After their marriage, William and Etheldra moved to Texas where both had lived previously (in Lamar Co.), but this time they moved to Wise Co. TX.
They are listed on the 1880 Wise Co. Census with three children, Robert, Levi, and Ellen. Living in the next household was John Clement with his wife, daughter, mother-in-law, and his brother William. John and William Clement were the sons of his cousin, Andrew Clement who was killed in the Civil War.
William and Etheldra moved to Jack Co. TX before 1887. Their last two children, Lillie and Charlie, were born in Jack Co. and their eldest daughter, Ellen, died there in 1893.
Found in the Public Library in Jacksboro, Jack Co. TX, was a softbound book entitled " Drouth Sufferers in Jack County -1887". Listed is the following information: "Clements, W., No. in family 6, Commissioner's Precinct 1, No. lbs. flour recd 150, No. lbs. meal recd. 228, date recd. 16 May 1887. This confirms that William and Etheldra were living in Jack Co. in 1887 and probably had been living there for perhaps a year at least to qualifiy for "drouth relief".
Another important piece of family history was found in the Jack Co. Library in a softbound book of listings of persons buried in the Wizard Wells Cemetery located at "Old Vineyard" in Jack County. Listed as buried in this cemetery are the following: (1) Clements, Infants of Etheldra and W. Clements - no birth or death dates (2) M.E. Swetnam, wife of G.H. Swetnam, d. 24 Sep 1893 Mary Ellen is buried beside the twins of Etheldra and William who are buried in one grave. These graves are very distinctly marked. They are raised above the ground with granite blocks, stacked two blocks high, and the length of the graves, with the tombstone on each grave embedded in the front of the granite that is at the head of the graves. The tombstones are still readable. On the twins tombstone, engraved in letters about 5 inches tall at the top of the stone is "INFANTS". Below that is "of Etheldra and W. Clements".
About 1894 the family moved to Oklahoma Territory. They are listed on the 1900 Oklahoma Territory Census in Burnett Township with their children Riley, Lillie, and Charlie. Living nearby are the families of Richard Burden, William Burden and Richard Henry Burden.
In 1910, the first Census for the State of Oklahoma lists William and Etheldra in the Burnet Township of Pottawatomie Co. Neighbors were the family of Richard Henry Lee Burden and the Charlie Clement family.