Hi Paul,

The 1881 census on FamilySearch.org has:

Name Relation Marital Status Gender Age Birthplace Occupation Disability
John KNEALE Head M Male 43 Lezayre, Isle of Man, England Farm Servant
Elizabeth KNEALE Wife M Female 44 Michael, Isle of Man, England
Robena KNEALE Daur Female 11 Ballaugh, Isle of Man, England Scholar
Mona KNEALE Daur Female 9 Michael, Isle of Man, England Scholar
Sarah KNEALE Daur Female 6 Patrick, Isle of Man, England Scholar
Joseph KNEALE Son Male 3 Patrick, Isle of Man, England
Source Information:
Dwelling Glenduff
Census Place Lezayre, Isle of Man, Family History Library Film 1342345
Public Records Office Reference RG11
Piece / Folio 5599 / 106, Page Number 3

So-far I have found only Joseph aged 13 in the 1891 census as a servant, elsewhere from the family.

Sue