I don't know whether this John is the one you want, but on the 1851 census of Bishopwearmouth HO 107/2396 Folio 142 81 Wear Street, (St Michael's Parish) WATERS Barbara Hd M 37 Master Mariners Wife DUR Sunderland " William So 12 " " " Alice Da 7 " " WATERS John So 5 DUR Sunderland " Barbara Da 3 " " " Mary An Da 1 " " MARTIN Barbara Vis Wid 82 " " Just incase! A Barbara Martin was baptsed at Sunderland Holy Trinity 21.3.1814 daughter of William & Alice Martin & A William Martin = Barbara Kinley at Holy Trnity13.4.1789 Hope this may prove to be the right John Avril