Laura,
I notice that Mary Robson, nee Lowther, is recorded as a widow on Census 1861.
There are several candidates for the death registration of John Robson (in both Sunderland, which covered Monkwearmouth, and Northumberland), but as ages were not recorded on Indexes until C1866, it is difficult to accept any of these as the "right" one.
I notice that the birthplace of Joseph Robson (Mary's son) is recorded accurately on C1851 (Monkwearmouth, Co Durham), c1861 (Sunderland, Co Durham) and C1871 (Sunderland, Co Durham)... but the Joseph Robson on C1881 in Heworth, is recorded as been born in Walker, Northumberland
Although Walker lay within the bounds of the Parish of Longbenton( at the south of the parish, on the northern bank of the River Tyne), Joseph and his grandparents lived around Benton Square, in the northern part of the parish.
Still looking for Mary, nee Lowther !.
Michael Dixon,
Blyth, Northumberland