Thanks for both replies so far.
In answer to the question 'how do i know he has a brother samuel, brother charles and sister charlotte', here goes:
I know that he had a brother Samuel as Samuel was living with John in Leicester in 1861. He is listed in the census as John's brother and was living there with his wife Phoebe (maiden name Thacker). I have found Samuel living with Phoebe's family as a lodger in the 1851 census so I think this is the right Samuel
The 1861 census lists John's birthplace as Kettering and Samuel's as Leicester so I have been looking in both places and the only listing I can find is Samuel Norwick in the Kettering Union Workhouse in 1841 with a brother Charles and sister Charlotte. The birth date is 1831 but no place of birth is listed. It may be the wrong person but it's all I've got.