son of George Grey & Margery, dau. of Gerard Salvaine of Croxdale. George was the apparently only son of Anthony Grey of Brancepeth, a son of George Grey, 2nd Earl of Kent & second wife Katherine, dau. of William Herbert, 1st Earl of Pembroke.
In 1639, Grey succeeded his childless second cousin once removed Henry Grey, 8th Earl of Kent. Henry was a great-grandson of Henry Grey, 4th Earl of Kent, another son of the 2nd Earl.
WIFE: Magdalene, dau. of William Purefoy of Caldecote & Catherine Wigston. Burke's Landed Gentry mentions his wife having a sister named Dorothy Purefoy who married Roger Dudley and was mother to Thomas Dudley, Governor of Massachusetts; however; other sources identify Susanna Thorne as the mother of Thomas, and Susanna's mother as Mary Purefoy.
Anthony and Magdalene had twelve children, all born in Burbage:
Grace (b. 1593) m. James Ward.
Henry, 10th Earl of Kent (24 Nov 1594 - 1651).
Magdalene (14 Nov 1596 - Sep 1668) m. John Browne.
Christian (8 May 1598 - 5 Jun 1681) m. (1626) Theophilus Burdett of Burton Overy.
Grey-1278 and Grey-201 appear to represent the same person because: same name, same location, take yours, same parents, yours are correct, same time frame.