I am looking for the siblings and ancestors of Cornelius DURHAM He was born ca 1775, I believe in London and married Ann MORRIS on 15 July 1800 in St. Brides Church, Fleet Street (George BASSET, W. Finch and Mary Ann FARR witnessed the wedding)and died intestate in London in June 1817. Administration of Cornelius's estate was grated to Ann in the London Consistory Court on 1 September 1817. Cornelius is described as a gentleman in this document.

Ann appears in the 1841 census, as a Lodging Housekeeper. The address is 17 Arundel Street, St. Clement Danes. Among those staying with her are, Sophia BECK and her three children John, Mary Anne and George. Sophia DURHAM married William BECK on 14 January 1824 in Old Church St. Pancras
(George BECK and Elizabeth ELLIS witnessed the wedding). This wedding is mentioned in family anecdotes, so there is a strong possibility that Sophia's father was a brother of Cornelius and that she is staying at her aunts house.Also staying with Ann is a John Durham, who I know nothing about.
Ann died on 18 June 1843 in London and Sophia on 13 February 1849. I have so far been unable to find Sophis's children enbloc in the 1851 census
It is possible that Sophia had a sister Ellen and both were born Kinfare, Stafford

Cornelius and Ann had three children Edmund (1806-1807), Cornelius Beavis (1809-1884) and John Farr (1812-1844). John Farr who never married was a watchmaker who lived in Southsea. He was buried in the Highgate cemetary of St. John's Church, Camden in January 1845.
Cornelius Beavis married Mary CUISSET in St. Andrew's Church, Holborn on 30 August 1836. (The wedding was witnessed by James PARRY., his son Orlando PARRY and Maria CUISSET. Cornelius was one of the better known Miniature Portrait Painters of the 19th century. He had connectios with John DAY, whom he taught to paint orchids. Cornelius Beavis married Mary Anne UPFILLl in 1872, after his first wife died. Cornelius Beavis died in Bournemouth on 28 May 1884.

In the 1871 Census Cornelius Beavis is staying with Martha PHILLIPS in Brighton and is described as a cousin, also staying there is an E. BIDDLECOMB, described as a sister. This would make Martha's mother a sister of Cornelius. A possible family is that of Henry PALMER who married an unknown Durham and who had three known children William (ca1817-ca1860), Elizabeth ca1818-1890) who married a Charles BIDDLECOMBE ca September 1845 and Martha who married George Richard PHILLIPS on 30 October in the Church of St. John of Jerusalem, South Hackney on 30 October 1838. George died ca 1849.
I consider further evidence that this is the right family, with the fact that in the 1851 census G. W. DURHAM (1847-1898) youngest son of Cornelius Beavis is staying in London with G.A. PHILLIPS (1842-ca1900), eldest son of Martha PHILLIPS..

So far unhelpful is the family anecdote that Cornelius.s father was known as DURHAM of Devil's Bridge