Hi Kay

I don't think that Thomas and Margaret are your family , by checking Brian Lawson's index in 1841 I found :

Braddan Thomas 53 and Margaret 40 , ref 1463/5 41 13

Braddan Thomas 35 and Isabella 35 , ref 1463/5 12 17.

Remembering 1841 ages rounded.

Found 1851 census :

Braddan Thomas 61 and Margaret 57 , reference 2525 466 49.

Onchan Thomas 48 and Isabella 42 , ref 2525 15 91.

Could the Thomas and Isabella in Onchan be yours ?

David Dwyer