The 1841 Rushen census (District 4 page 1 entry 2) shows this Sansbury family:
John 49, Jane 45, Ann 2, John 25, Joseph 17,
Margaret 14, Thomas 5, and William 20 .
At the same entry is John Crebbin 76 and Jane (alias Qualtrough?) 73. So Jane Sansbury is probably the daughter of John & Jane Crebbin.
Bruce