This is the chap you saw but wife is Ada. Lavinia must have died not long after 1881 census as these people have a child born 1882
70 Warner Road Walthamstowe
Edward Johns 1855 Portscatho??th ?? Head Joiner and Carpenter
Ada Johns 1872 Bethnal Green, London, Wife
Beatrice L Johns 1882 Plymouth, Devon, Daughter Bead Worker
Althea Johns 1889 Walthamstow, Essex, Daughter
Charles W G M Johns 1900 Walthamstow, Essex, Son
Edward T Johns 1897 Walthamstow, Essex,Son
Florence M Johns 1893 Scranba, PA Daughter
Robert M Johns 1899 Walthamstow, Essex, Son
RG13/1633 West Ham Walthamstowe Folio 121 Page 45