Note: Phillip's second wife, Margery [Hunt] was [his first wife] Catherine's sister or first-cousin. Different accounts of the family show about a dozen children listed within different family groups with either Catherine or Margery as the mother. It's not believed any of Phillip's children were by Henrietta, his 3rd wife.
Phillip's third wife, Henrietta (Brashear / Mayfield) Prather, administered his Will at Enoree River, South Carolina. Phillip lived on his plantation in Canton County [sic = Prince George's Co.; Canton is a town, not a county], Maryland for many years before he sold it and moved to Virginia, Florida [sic=he moved to Orange Co., North Carolina], finally settling in the Upper Enoree River, South Carolina, where he died in 1767. His plantation in Maryland was part of "Sprigg's Request Plantation" [in Queen Anne's Parish, Prince George's County]. [NOTE by Chet Snow : The Enoree River is in Laurens Co., South Carolina, not North Carolina].
The following was researched and written by Prather family genealogist, Gary Benton Prather (entered 08/03/95): 
Philomen Prather's father gave him 166 acres of land, being part of a tract called 'Sprigg's Request' in his Will, which was written December 13, 1711. 
Martha [Sprigg] Prather, on April 29, 1719, conveyed to her son Phillip, when he was 18 years old, ten pounds sterling money.
In a letter, to Honorable Alexander Contee Hanson, Esq., Chancellor of Maryland, Philomen reviews the many legal transfers of a tract of land, being part of his Lordships Mannor of Concoheague in Prince George County, Maryland:
"Van Swearingen of Prince George's Co., Maryland, leased October 9, 1737, of Benjamin Tasker a tract of land, being part of his Lordships Manor of Concoheague, 999 acres, for his life and the lives of his wife Elizabeth and his daughter Priscilla. This land remained in the possession of Van Swearingen until Decmber 8, 1739 when he assigned his rights to Phillip (Philomen) Prather, who, wishing to change to lease to obtain one for the land for his life and the lives of his wife and one of his children. Phillip made application to Benjamin Tasker, who granted a new lease which included the names of Phillip Prather, Margery Prather (his wife) and Elizabeth Prather (his daughter). Phillip retained possession until September 1756 when he assigned his rights to Joseph Bench and with his family moved to North Carolina" [he moved first to North Carolina, then to the Enoree River area in South Carolina].
"Martha [Sprigg] Prather (later Mrs. Yoakley) gave Phillip Prather all that part of a tract of land called "Sprigg's Request" and in my Lord's Manor upon Collington, belonging to me, which is now in his possession by a division made between him and his brothers (Thomas and John) by virtue of their father's Will and in order to prevent my son Thomas from claiming the same of disturbing either of them in their peaceable possession of their parts; in her Will written June 19, 1742."
Phillip Prather sold to Richard Duckett part of a tract of land in Prince George's County, Maryland called "Sprigg's Request" on March 25, 1740. Upon completion of sale, Phillip Prather moved to Concoheague Manor, Frederick County, Maryland. 
Phillip Prather moved to North Carolina after September 2, 1756 and the first record for him there was in the oldest court records of Orange County, North Carolina in 1761. He remained in Orange County, NC as late as 1765, when he served on a jury with Jesse Brashear.
Jesse Brashear, b: 1734 in Prince George's Co., Maryland, married Phillip Prather's daughter, Elizabeth, in 1756 in Orange (later=Guilford) Co., North Carolina. Jesse's sister, Henrietta Brashear, b: ca. 1736 in Maryland, became Phillip Prather's 3rd wife in 1758; they married in Orange (Guilford) Co., North Carolina, then moved to the Upper Enoree River, South Carolina, in 1765. Henrietta, often called "Henrietta Mayfield," may have been a widow (1st husband named Mayfield) when she married Philomen "Phillip" Prather, himself 2 times a widower. Clearly these two Maryland families (Prather & Brashear) knew each other and they possibly moved together south to North Carolina.
Philomen 'Phillip' Gittings Prater (Prather) died shortly before September 23, 1767 in what is now Laurens County, South Carolina [plantation near the Enoree River, SC].
"Citation granted to Henerete Prather and Middleton Brashear to administer the estate and effects of Phillip Prather, late of Enoree, Planter., deceased, his widow and brother-in-law to be read in said parish church and returned certified September 23, 1767." Note that Middleton Brashear, Henrietta's brother, is called Phillip Prather's brother-in-law, confirming her last name was originally Brashear.
An inventory of Phillip's estate was made. It was appraised by Charles D. Bradford and William Barry on December 14, 1767.
Source: S-2142494832 Repository: #R-2147357987 Title: Family Data Collection - Individual Records Author: Edmund West, comp. Publication: Online publication - Provo, UT, USA: The Generations Network, Inc., 2000. Note: APID: 1,4725::0
Source: S-2142494922 Repository: #R-2147357987 U.S. and International Marriage Records, 1560-1900: Yates Publishing: Online publication - Provo, UT, USA: The Generations Network, Inc., 2004. APID: 1,7836::0
Source: S20 Yates Publishing: U.S. and International Marriage Records, 1560-1900; Online publication - Provo, UT, USA: Ancestry.com Operations Inc, 2004. Repository: #R1 Record ID Number: MH:S20 User ID: 338789E1-0B25-4A52-A0EC-92F88E48D1D0 - Repository: R1http://www.Ancestry.com Record ID Number: MH:R1 User ID: B1696161-7A17-42E7-9EE7-1C83D3676BD5
Source: S26Family Data Collection by Edmund West, comp.; Individual Records; Online publication - Provo, UT, USA: Ancestry.com Operations Inc, 2000. Repository: #R1 Record ID Number: MH:S26 User ID: 71D5BDBF-8847-461F-BDC1-B9E1ABA99663
Source: S27 Family Data Collection by Edmund West, comp.; Births: Online publication - Provo, UT, USA: The Generations Network, Inc., 2001. Repository: #R1 Record ID Number: MH:S27 User ID: DDF13E06-D1A8-4D21-976D-4CDD427E1493
Source: S86 Family Data Collection by Edmund West, comp.; - Deaths; Online publication - Provo, UT, USA: The Generations Network, Inc., 2001. Repository: #R1 Record ID Number: MH:S86 User ID: E599BC92-94B0-4221-BB55-62C6C082C0BC
WikiTree profile Prather-88 was created through the import of Shortened files.ged on 30 December 2010.
WikiTree profile Prater-104 was created through the import of Paula's family 5-28-2011.GED on May 29, 2011 by Paula Marksman. See the Changes page for the details of edits by Paula and others.
WikiTree profile Prater-152 was created through the import of Mulkerin Family History Site.ged on Dec 15, 2011 by Samantha Mulkerin. See the Changes page for the details of edits by Samantha and others.
WikiTree profile Prater-156 was created through the import of Mulkerin Family History Site.ged on Dec 15, 2011 by Samantha Mulkerin. See the Changes page for the details of edits by Samantha and others.
WikiTree profile Prather-929 was created from first-hand information as remembered by Leroy Matlock, Sunday, February 8, 2015. This duplicate profile was merged into Prather-88 by Chet Snow on June 7, 2016.
It may be possible to confirm family relationships with Philip by comparing test results with other
carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: