A baptism on Familysearch :
William Walker, baptized 27 Aug 1842, Aycliffe, Durham, son of Bridget Walker.
A marriage on FreeBMD, Darlington, Jul-Sep qtr 1843, Bridget Walker and John Chapman. Durham Council BMD site confirms the marriage.
1851 census, Yarm,
John Chapman, Head, Railway Lab., b. Aycliffe.
Bridget ", wife, 29, b. Langledale,
William ", son, 8, b.Woodham Burn,
John ", son, 4, b.Woodham Burn,
HO107/2383/116/33
1861 census,
10 Green St., Darlington,
Bridget Chapman, head, wid, 38, b. Langledale,
William ", son, 18, Fireman of Engine, b. Woodham,
John ", son, 14, Plumbers Assistant, b. Stranton,
RG9/3679/83/18
Alan.