He was succeeded by his grandson, the second Baron, who was created Earl of Stamford in the Peerage of England in 1628.

Stamford was one of the judges at the trial of Charles I and one of the regicides who signed the King's death warrant.

Stamford was succeeded by his grandson Thomas, the second Earl and the only son of Lord Grey of Groby.

Thomas Grey was a politician and served as Chancellor of the Duchy of Lancaster and as President of the Board of Trade.

He lived in South Africa, and had married his housekeeper Martha Solomons after she had already given birth to two of his children, the elder of whom was a boy.

The main family seat of the Earls of Stamford in later years was Dunham Massey Hall, near Altrincham, Cheshire.

Another ancestral seat of the Grey family was Enville Hall, Staffordshire, and the house is occupied by relatives of Catherine Cox, Countess of Stamford and Warrington born 11 October 1826 Sturminster Marshall, Dorset died 29 January 1905 Bradgate House, Groby, Leicestershire.

This was devised (bequeathed) by George Harry Grey, 7th Earl of Stamford to his great niece, Catherine Payne, who married Sir Henry Foley Lambert, 7th Baronet (who took the surname Grey) in 1905, and subsequently to his granddaughter.

Sarah Letitia Cox was brought up under the wing of her aunt Catherine, Countess of Stamford and Warrington and Catherine also took under her wing Robert Miller Cox illegitimate son of Tamar and who became the estate agent at Dunham Massey Hall.