This looks like them in 1851, as you say you don't have anything else on the family:
HO107/2392 fol.355 p.31 South Hetton, Haswell Henry Turnbull head mar 41 Blacksmith Durham Houghton le Spring Jane " wife " 50 " Gateshead William " son unm 20 Blacksmith Northd, Cramlington John " " " 18 " " Robt. " " " 16 " " Margt. " dau 11 Scholar Durham East Murton Henry " son 9 "
will now look for them later Barbara
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Census and bmd information is Crown Copyright, from www.nationalarchives.gov.uk and www.scotlandspeople.gov.uk Norfolk - Ebbs Whiterod Zipfell Lincs & Yorks - Sivills Predgen Sweden - Jönsson Cronberg Andersson Yorks - Spence Hide Hird Durham - Dalkin Selby Renwick Somerset - Keen Hitchins
Margaret Turnbull married Dec Qu 1857 Easington 10a 395 Anthony Knox on same page
1861 RG9/3746 fol.34 p.20 South Hetton, Haswell Anthony Knox head mar 25 Colliery Labourer Houghton le Spring Margaret " wife " 21 Dalton le Dale Ann " dau 3 Easington Jane " " 2 " William T " son 6 months "
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Census and bmd information is Crown Copyright, from www.nationalarchives.gov.uk and www.scotlandspeople.gov.uk Norfolk - Ebbs Whiterod Zipfell Lincs & Yorks - Sivills Predgen Sweden - Jönsson Cronberg Andersson Yorks - Spence Hide Hird Durham - Dalkin Selby Renwick Somerset - Keen Hitchins