Hello Peter,
Here they are in 1841
HO107/532/6 folio 10
Stamford Street, A-u-L
James Mellor, 43 yrs, Solicitor, born in the county
Ann Mellor, 43 yrs. NOT born in the county
Ann Mellor, 19 yrs, born in the county
Margt Mellor, 17 yrs, born in the county
(?) male Mellor, 15 yrs, born in the county
John Mellor, 13 yrs, born in the county
Caroline Mellor, 12 yrs, born in the county
Charles Mellor, 7 yrs, born in the county
Eliza Mellor, 6 yrs, born in the county
Miriam Mellor, 3 yrs, born in the county
Elizabeth (Hurst?/Street?), 32 yrs, F. Servant, NOT born in the county.
Hannah Lees, 27 yrs, F. Servant, born in the county.
I cannot read the name of the female servant as it is not very clear, but if you put another posting up with the piece no. and folio no. to see if someone else can decipher it, I thought as a
very long shot she could have perhaps been a sister to Ann as they were both NOT born in the county, then perhaps you can go from there.
They are not in the 1851 census on Stamford Street or Alma Street, Birkdale.
Sorry if this is not much help.
georgie