The 1881 census shows Jane Sansbury 42, mariner's wife with Margaret 6, Robert 4 and Thomas Henry 2, in Rushen.
I cannot trace any of the children in the IGI. There were 3 Jane Moores who were born in Rushen 1838/9. There is no record of the children or of any corresponding Jane Moore marriage in the IGI.
Odd. Possibly dissenters?
In the 1891 census at 15 Drinkwater Street in Douglas (ward 3) there is Thomas Sansbury 48 mariner Jane Sansbury 47, Maggie 16 dressmaker, Robert 14 Tobacco spinner and Thomas Henry 12 Scholar. They were all born in Kirk Rushen.
On May 13 1832 a Thomas Sansbury was christened in K. Rushen, son of John Sansbury and Jane Crebbin. He would seem to be a likely candidate.
Hope this helps