Hi Christine,
I found this family on the 1851 census minus Ann
Civil parish Islington, reg dist Islington,
Jane Stow age 53 born Liverpool
John Stow age 73 born Ipswich Suffolk occ book binder
1861 census
civil parish Clerkenwell, reg dist Clerkenwell , sub reg dist Goswell Street
address 66 Myddleton Street
Ann Elizh Stow dau age 24 born Margate Kent occ jewel case liner
Jane Stow head widow age 63 born Liverpool
Cant find this family on 1841 census as of yet, looks as if they may have been mistranscribed, nor can i find Ann on the 1851 census.
If you have Ann's fathers name and occ, then this might establish if they are the right family.
Julie