Hi dizz,
There are these from the IGI:
with father Jeremiah Grantham, mother Mary Ann
George christened 25 Dec 1847 Pillerton Hersey Warwick
Charles chr 20 Apr 1854 Pillerton Priors Warwick
Joseph chr 20 Apr 1854 Pillerton Priors Warwick
And these may also belong to you:
George Grantham chr 1 Jan 1837 Pillerton Priors, father William Grantham, mother Sarah
George Henry Grantham chr 4 Jun 1876 Oxhill, Warwick, father Charles Grantham mother Jane
There may be more children. I will check the BVRI.