Is this the family in 1871 RG10; Piece: 1339; Folio: 137; Page: 13
If so -- more children

High Cross Road Tottenham
Louisa Harman 45yrs Widow Marine Store Dealer b King Street Old Street
Emma Harman daur 20 yrs domestic servant
Thomson Harman son 16 yrs Baker's boy
Mary Ann Harman daur 14 yrs
Sarah Harman daur 12 yrs
Eliza Harman daur 9 yrs
children born Tottenham
Eliza transcribed as Elery - looks like 'Elary' so not sure but Emma would fit and this Sarah almost fits with 1881.
Nvb hopefully will tell us.