Found this family on 1901 ... no sign of Bertram BUT there is an Abraham (Grandad), Samuel (Father) and a Maud (daughter) .... Samuel is an iron worker - puddler.  There is always the possibility that his ages are wrong on all 3 counts - my grandfather is 10 years older than he should be on his marriage cert for no obvious reason!
1901 Census 
Abraham Johnson 58  Sedgley, Staffordshire, England Head  Sedgley  Staffordshire   
Eliza Johnson 64  Nk, Shropshire, England Wife  Sedgley  Staffordshire   
Saml Johnson 5  Sedgley, Staffordshire, England Adopted Son  Sedgley  Staffordshire   
Job Wilkes 1  Sedgley, Staffordshire, England Grandson  Sedgley  Staffordshire   
Lily Wilkes 10  Sedgley, Staffordshire, England Granddaughter  Sedgley  Staffordshire   
Maud Wilkes 6  Sedgley, Staffordshire, England Granddaughter  Sedgley  Staffordshire   
Sam Wm Wilkes 4  Sedgley, Staffordshire, England Grandson  Sedgley  Staffordshire   
Samuel W Wilkes 33  Tipton, Staffordshire, England Son-in-law  Sedgley  Staffordshire   
Sarah Wilkes 34  Sedgley, Staffordshire, England Daughter  Sedgley  Staffordshire