William and Sela Green were members of the Brushy Creek Baptist Church in Greenville County, South Carolina from about 1832. William preached there on several occasions and two of his slaves, Nathaniel and Matilda, were admitted into membership in 1832 as well. A Nancy Green was accepted into membership in 1842, based on experience, so it seems unlikely to be William and Sela's daughter.
The Green Family Cemetery is located in Greenville County, off of Brushy Creek Road, on Quincy Road (104 Quincy Drive). In this cemetery are buried John (June 13, 1782-June 27, 1852) and Mary Green (December 4, 1795-November 12, 1855), John P Green (Aug 31, 1830-January 7, 1850), Amanda Green (Aug 3, 1850-July 11, 1862, d/o W B & Nancy Green) and Lemuel Green (Dec 25, 1814-August 29, 1852) plus 8 other unreadable [http://rfci.net/wdfloyd/greengrn/htmlGreenville County, SC Cemeteries]. John Green is just old enough to be the father of William M. Green but his wife Mary is probably not old enough so either this is William's brother and his wife or perhaps his father and second wife. Some of the others may be grandchildren.
There is another William Green buried in Rutherford County, NC in the Bostic Brickyard Cemetery, who died November 6, 1832, at the age of 81 years. The relationship to Willaim and Sela is unknown.
In the New Prospect Baptist Cemetery in Spartanburg County, SC, is buried Mar Agnes Greene 33y, 9m,15d, W/o SA Greene d/o W A Cantrell.
Nita Porter says that William Green, father of Winsberry (aka Berry) received his Confederate Soldier's Pay, which she believes was his first and only paycheck.
From National Archives Order for Copies of Veterans Records, William Green did, indeed, sign the Application for Money Due Deceased Soldiers. The amount received was $38.50, of which $25 was for his uniform.
In 1860, William and Seely Greene are living in Poplar Springs, Pontotoc County, Mississippi. They are living within two residences of Thomas and Nancy Greene Porter and next door to Cullen and Nancy Dillard, who are next door to Colden and Manah Dillard. Six residences away are James and Sarah Green. Another six residences down the road are possibly Joshua and Elizabeth Dillard.
In 1850, William Green was living next door to Thomas and Nancy but appears not to have a wife and two children are living with him, as is a 45-year-old female whose name might be Christian, though it is difficult to read the name.
Nearby is a Berry Green, age 38, who seems to be of an age to be William's brothers, after whom his son was named.