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