Children of Henry Cubbon/Ann Moore of Arbory

Ann CUBBON Christening: 28 Aug 1814 Arbory, Isle Of Man
Elinor CUBBON Christening: 26 May 1816 Arbory, Isle Of Man
Henry CUBBON Christening: 30 Aug 1818 Arbory, Isle Of Man
Catherine CUBBON Christening: 13 May 1821 Arbory, Isle Of Man
Elizabeth CUBBON Christening: 22 Jun 1823 Arbory, Isle Of Man
John CUBBON Christening: 31 Jul 1825 Arbory, Isle Of Man
Jane CUBBON: Christening: 11 Mar 1827 Arbory, Isle Of Man
Edward CUBBON Christening: 2 Dec 1832 Arbory, Isle Of Man

1841 Index
Arbory 2 7 24 ages were rounded
Ann Cubbon 40
Henry 22
Ann 20
Catherine 19
Elizabeth 15
John 12
Jane 10
Edward 9

1851 Arbory Census
Colby
Ann Cubbon head widow 58 publican b Arbory
Ann dau unmar 36 "
Elinor dau unmar 34 "
John son unmar 21 mason "
Edward son unmar 18 joiner "
Ann grdau 7 scholar "

So there are both Jane and Ann in this family.
You didn't mention 1861 census age of Ann Cubbon visitor nor of Jane Turnball

You mentioned that John T was with aunt Isabella Clague in 1851--where was the census, what ages are they, anyone else in the household?
DJD