Hi Zebedee!
I assume you already have the 1901 census from your first posting, when the family were at no 28, North Street, so here is the family in 1891 -
Reference - RG12 1884 Folio 21 Page 36
Address - 12 North Street, Bridgewater
Details -
Charles Potter - Head - Mar - 31 - Police constable - born Creech St Michael, Somerset
Rosanna Potter - Wife - Mar - 33 - - born N Petherton, Somerset
Minnie Potter - Dau - - 10 - Scholar - born Thurloxton, Somerset
William Potter - Son - - 6 - Scholar - born Bridgewater, Somerset
Herbert Potter - Son - - 4 - Scholar - born Bridgewater, Somerset
Rosanna Potter - Dau - - 2 - - born Bridgewater, Somerset
Charles Potter - Son - - 4 months - - born Bridgewater, Somerset
William Vickery - Lodger - Single - 18 - Baker's Assistant - Bateaston, Somerset
And in 1881 -
Reference - RG11 2372 Folio 114 Page 8
Address - The Village, Thurloxton, Somerset
Details -
Charles Potter - Head - Mar - 21 - Ag Labourer - born Creech St Michael, Somerset
Rosanna Potter - Wife - Mar - 23 - - born North Petherton, Somerset
Minnie F Potter - Dau - - 10 months - - born Thurloxton, Somerset
And Charles with his family of origin in 1871 -
Reference - RG10 2368 Folio 100 Page 20
Address - Adsborough, Creech St Michael, Somerset
Details -
William Potter - Head - Mar - 66 - Farm labourer - born Thurloxton, Somerset
Anne Potter - Wife - Mar - 57 - - born Thurloxton, Somerset
Jane Potter - Dau - Unm - 39 - Servant Domestic - born North Petherton, Somerset
Mary A Potter- Dau - Unm -
19 - Servant Domestic - born Creech St Michael, Somerset
Age corrected - mistyped the first time 
Charles W Potter - Son - - 11 - Scholar - born Creech St Michael, Somerset
Caroline Thorne - Niece - - 9 - Scholar - born Thurloxton, Somerset
John Rugg - Visitor - Unm - 21 - Carpenter - Bridgewater, Somerset
James Palmer - Visitor - Unm - 22 - Carpenter - Stoke Sub Hambden, Somerset
And again in 1861
Reference - RG9 1615 Folio 13 Page 20 and Folio 14 Page 21
Address - Coombe, Creech St Michael, Somerset
Details -
William Potter - Head - Mar - 56 - - born Thurloxton, Somerset
Ann Potter - Wife - Mar - 44 - - born Thurloxton, Somerset
Mary Ann - Dau - - 9 - - born Creech St Michael, Somerset
Charles - Son - - 1 - - born Creech St Michael, Somerset
Given the huge ( and varying!) gap in age between William and Ann, I wouldn't mind betting that this is a second marriage ....
If you would like, I can look for William and his family in 1851 and 1841. Also, there is a promising looking marriage on FreeBMD in June quarter of 1879, Bridgewater district, ref 5c 578. There is a Rosanna Western in the same reference so it's a pretty safe bet that this is them.
Hope this helps
Angela