sentences:  Knyvett married, before 9 July 1506, Muriel Howard, the widow of John Grey, 2nd Viscount Lisle, by whom she was the mother of Elizabeth Grey, Viscountess Lisle, who was at one time betrothed to Charles Brandon, 1st Duke of Suffolk.Muriel Howard was the daughter of Thomas Howard, 2nd Duke of Norfolk, and Elizabeth Tilney, and through the Howard connection, Knyvett was related to many of the great figures of English history (his brother-in-law, for example, was Thomas Boleyn, father of Queen Anne, and grandfather of Queen Elizabeth I).By Muriel Howard Knyvett had three sons and two daughters, Edmund (1508–1551), Katherine, Ferdinand, Anne, and Henry (died c. 1546).