My information is that William Coleman, who was born about 1720, based upon the fact that he was listed in the 1740 and 1749 Amelia tithable lists, was the son of William Coleman and Faith Godfrey. William, Jr. was listed in father's will as receiving 200 acres of land. His siblings were (order of birth uncertain): Frances (probably about the oldret), married Robert Tucker, Jr.; Robert, (probably the oldest son as he was named as executor of his father's estate; married Ann Hinton; Joseph, married Elizabeth ___; Daniel, who married Elizabeth ___; William, who married Frances [Archer?]; Godfrey (who was unmarried); and Peter, who married Martha Archer. Your William and his brother Peter interited their brother Godrey's estate.
Some details of the early Coleman family are included in the book: "Robert Coleman of Mobjack Bay, Virginia."
Will share further details later if you're interested.