Beccy, 1881 census for your Stagg family
Dwelling: Hospital St Court 9 House 13
Census Place: Birmingham, Warwick, England
Marr Age Sex Birthplace
John STAGG M 43 M Bham, Warwick, England
Rel: Head
Occ: Gun Stocker
Mary STAGG M 43 F Ireland
Rel: Wife
James STAGG U 23 M Bham, Warwick, England
Rel: Son ((Unm))
Occ: Gun Stocker
Wm. STAGG 17 M Bham, Warwick, England(Your g/g/grandfather)
Rel: Son
Occ: Gun Finisher
Jno. STAGG 16 M Bham, Warwick, England
Rel: Son
Occ: Brass Founder
Sarah Ann STAGG 15 F Bham, Warwick, England
Rel: Daur
Occ: Steel Pen Maker
Robert STAGG 13 M Bham, Warwick, England
Rel: Son
Occ: Scholar
Joseph STAGG 9 M Bham, Warwick, England
Rel: Son
Occ: Scholar
Louisa STAGG 7 F Bham, Warwick, England
Rel: Daur
Occ: Scholar
William Stagg married Sarah Jennings September qtr 1885 and William John was born in the same qtr.
In 1891 William jnr is with his grandparents at 7 Hatchett Street.
John Stagg age 54 Gun Stocker
Mary age 56 b. Ireland
Robert age 23
Joseph age 19
louise age 17
grandson William age 5.
I have been unable to find Wm and Sarah on 1891.