To Petmas
Yes that John Kemp was the father of John Henry Camp. John Henry Camps grandfather, whos name was not given was also stated to be " a sheriff's officer living in Bond Street and was a familiar character in Brighton,Sussex. I havnt been able to find out any more about his grandfather.
J.H.Camp's father John Camp (born about 1800)married Maria Inman Feb 5,1824 at St Nicholas,Brighton,Sussex. However I also find a record for a John Camp,born 1801 Sussex with a wife of Maria Hall,born 1801 Newhaven,Sussex so not sure which Maria is the correct one.
When J.H.Camp was born 1826 the family was living in Newhaven,Sussex and in other replies is a list of J.H.Camp's siblings. I have found two bankruptcy records, one is for Feb 22,1839 for John Camp the grocer but also one for John Camp the grocer of Newhaven Sussex for Feb 13,1808 which must be for J.H.Camps grandfather based on the date,unless its just a coincidence.I would think that J.H.Camps grandfather would have to been born about 1780 but I have no information about him or his wife or what children they had apart from John born abt 1800. I expect the whole line of Camp's were from Sussex in the Newhaven area.
Here is what I have from all of your input and what I found out for the children of John and Maria Camp;
1) John Henry Camp b1826 Newhaven,Sussex
2) Selina b1828; married George Norton 1851; 1851 census has her living at 168 Western Rd in Brighthemstine,Sussex as niece to Betty Tuman b1806 Brighton (so Betty must be John Camp's sister)
3) Sarah Emma b1830; in 1851 census at Brighthelstone she is a servant nurse,Must have married after 1851
4) Elizabeth b1833;living with sister Harriett 1851; married 1863 to John Haynes son of Benjamin Haynes.
5) Harriett b1835;in 1851 census living with Mary Clark Rout at Brighthelmstone with sister Elizabeth and both listed as nieces of M.C. Rout so M.C.Rout,age 76,must be a sister of John Camp b1800 but if her age in the census is correct she was born 1775 which is too old.; Harriett was married 1859
6) Alfred b1839; In 1861 he is a lodger with the Blackmer family and then married Aug 31,1862 Elizabeth Blackmer,daughter of Francis and Mary Blackmer.Elizabeth born 1840 Brighton.Alfred died April 1895 Brighton.
7) possibly Mary b1825

possibly Charles b1826
In 1851 census Maria Camp ,widow of John Camp and her son Alfred (b1839)are living in the workhouse at Newhaven,Sussex.In 1861 census Maria (born 1799 Dorking),widow, is a lodger in Brighton. Have death record for Maria b1797 died Jan 1868 Brighton. Not sure when Maria's husband died but was after 1841 census and before 1851