Robert was born between 1651 and 1660 in Kingston Parish, Gloucester County, Virginia. He married an Elizabeth in the early 1680s in Gloucester County, Virginia, together they had eleven children, eight boys and three girls. The preponderance of evidence is for Elizabeth being a Garnett whose father or brother was John Garnett. 
Robert, his brother John, and father or brother-in-law John Garnett came to Essex County Virginia in 1692 from Kingston Parish, Gloucester County, Virginia and on September 7, 1692 they bought adjoining land from John Baker in Essex County near the Rappahannock River. Robert bought 200 acres in Saint Ann's Parish on Gibson's Run (present day Mount Landing Creek) where he and Elizabeth raised their family of 11 kids. In May 1710 Robert received 50 more acres from John Ridgedale. In 1713/14 her received 100 more acres from John Butler. He was a yeoman.
Will, signed 06 Jan 1715/6, probated 22 Feb 1715/6:
To son Robert Jr., the plantation where he ( Robert Sr.) lives, his mother to have use of it for five to six years
To sons James and John "land where I Dwelt: to be divided between them James to have his choice",
The Foster Family of Flanders, England and America by Dr. Billy Glen Foster. 1990. snippet view of book; Quote page 38: Robert Foster, brother of John and son of either Richard or James Foster, was born ca. 1663 in Gloucester County, Virginia. The 200 acres of land patented by Robert in Essex County in 1692 was part of a large parcel of land which was subdivided: Captain William Boseley was sold 200; John Garnett, 600 (possible a brother of Elizabeth, Robert Foster's wife); Robert Foster, 200; John Foster, 200; William Smither, 200; William Bastyn, 200: William Howlett, 200; Anthony Samuel, 300; Motton...; Quote page 39: The land was bounded by land owned by John Ridgedale. His original home had, perhaps, become to small for there is an indication that he built another plantation house on his newly acquired land. It could have been that Robert and his wife simply wanted a grander house; more space, however, is the more likely considering their large family. The Foster children, at least the boys, were educated; their parents saw to it. ... from Robert's will that he was married only once, to Elizabeth Garnett, for the will states clearly that Robert Jr. inherited the plantation, however his mother would have use of it). James and John, next oldest sons, were given the remainder of the estate. The original 200 acres was divided between them. Gibson Run made a natural division of the land with 75 acres lying on the North and 125 acres on the South. ... Portions available online.
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It may be possible to confirm family relationships with Robert 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: