William Magruder was one of five sons ( John, James, William, Alexander and Nathaniel) identified as under 16, and thus born no earlier than 1694, in Samuel Magruder's 2010 will.  Named as a child of Samuel Magruder by Papenfuse.
He was born about 1701 in Prince George's County, Maryland. 
In father's 1710 will, to receive with brother James Turkey Cock Branch.
Married to Mary whom some sources identify as Mary Frazer.
1731 Inheritance from mother
Named in mother's 1731 will.
Will in 1765 devised Turkey Cock Branch and part of Vale of Benjamin.
↑ 1.01.1 Prince George's County Will book I Page 46.
↑ Source: #S167 Page: accessed 8/26/09), Samuel Magruder Quality or Certainty of Data: 3 Note: Submitted by Peter in 2003. Data: Text: Samuel, 1684 - Ninian, 1686 - Elizaabeth CA 1688 - Verlind CA 1690 - Sarah CA 1692 - Sarah CA 1692 - Mary CA 1693 - John 1694 - James 25 Jan 1696 or 97 - william CA 1701 - Eleanor CA 1705 - Alexander CA 1706 - Nathaniel CA 1707.
It may be possible to confirm family relationships with William by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: