Hi
I don't know whether this will help or not but I did find your Joseph in the 1861 with his mum and dad
Alexander Dunbar abt 1817 Scotland Head Shoreditch St Leonard Middlesex
Margaret Dunbar abt 1826 Scotland Wife Shoreditch St Leonard Middlesex
Margaret Dunbar abt 1851 Stepney, Middlesex, England Daughter Shoreditch St Leonard Middlesex
Mary E Dunbar abt 1853 Stepney, Middlesex, England Daughter Shoreditch St Leonard Middlesex
Joseph Dunbar abt 1855 Stepney, Middlesex, England Son Shoreditch St Leonard Middlesex
Charles Dunbar abt 1857 Haggerstone, Middlesex, England Son Shoreditch St Leonard Middlesex
Jane Dunbar abt 1859 Haggerstone, Middlesex, England Daughter Shoreditch St Leonard Middlesex
Mary Ann Hutcheson abt 1832 Scotland Sister-in-law Shoreditch St Leonard Middlesex
WEndy