You may not find any relatives other than your own family. Daisy posted the census details earlier:
1841 HO107/1063/6 f.5 p.3 St Mary Newington
Brighton Place
CORY
Wm 40 Clerk N
Sarah 40 N
Wm Hy 10 Y
Hy 5 Y
Louisa 5? Y
Albert 3mo Y
Ann DONOVAN 15 F S Y
1851 HO107/1573 f.357 p.31 Lambeth
3 Kingswood Place
William CORY Head 52 Clerk Machine Canning Co Cornwall Calstock
Sarah Wife 50 Surrey Ripoley?
William Son 19 No employment " " Newington
Henry Son 17 Clerk to Iron Merchant " " " "
Louisa Daur 16 Scholar " " " "
Harriet Daur 9 " " at home " " " "
Daisy
The children's ages recorded in 1841 are not quite correct. As far as I can see the children were:
1831 William Henry
1833 Henry Thomas
1834 Louisa
1836 Ada Elizabeth
1839 Albert Israel
1842 Harriet Betsy
Ada Elizabeth and Albert Israel died as infants, Ada in 1840 aged 3 years and one month, and Albert in 1842 also aged 3 years and one month.
Louisa and Harriet never married and can be followed through the census. Harriet died in 1912 and Louisa died in 1929. Harriet did not leave a will but the administration of her estate went to Louisa.
Louisa did leave a will and it would be worth getting a copy to establish beneficiaries. There was a short obit in the Sussex Agricultural Express (Lewes, East Sussex, England) on 28 June 1929. She was aged 94, had lived at Uckfield for 16 years, her only relative was her nephew William Hill CORY of South Carolina, and she was buried in the family grave at Norwood.
I do not know what happened to Henry.
Wills and administrations can be searched and copies purchased here:
https://probatesearch.service.gov.uk/#calendarDebra
