Hi Jennifer

I've been looking at your Turnbulls, Cubbons and Cregeens, and here's what I've found:

1841
Rushen 3/1
Ballaqueeney
Hugh Turnbull 47 mariner
Margaret 46
Thomas 22
John 16

1841
Rushen 3/1
Ballaqueeny
Henry Cubbin 45 (or 43 ?) mason
Margaret 36
Jane 15
Margaret 12
Isabella 8
John 5
Catherine 1

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Jane Cubbon's parents and siblings:

1851
Rushen 3/7
Cubbons House
Henry Cubbon head mar 53 mason
Margaret wife 46
John son 15
Catherine dau 11
Mary Ann dau 1
all b Rus

and Jane was working at Kentraugh:

1851
Kentraugh
Jane Cubbon servant unm 25 cook b Rushen
Head of household is Edward Gawne.

1851 --- John Turnbull was with his Aunt Isabella Clague in Liverpool.

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1861
Rushen 3/23
Balnequeene
Henry Cubbon head mar 62 mason
Margaret wife 55
Mary A dau 11
all b Rus

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1871
Rushden 3/8
Ballaqueeney, household 39
Henry Cubbin head wid 72 mason b Rus
Mary A dau unm 21 school mistress b Rus
Catherine J Turnbull granddaughter 10 scholar b Liverpool

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So Catherine J Turnbull, sister of your Margaret, was living with her maternal grandparents in 1871. I'd say that here's your proof that the John Turnbull / Jane Cubbon 1853 marriage is definitely the right one. Below are 2 possible births for Catherine. If I were sending for a certificate, I'd go for the "Catherine Jane" option first as the 1871 census entry looks like Catherine J.

England & Wales, FreeBMD Birth Index, 1837-1915
about Catherine Jane Turnbull
Name: Catherine Jane Turnbull
Year of Registration: 1861
Quarter of Registration: Jan-Feb-Mar
District: Liverpool (1837-1934)
County: Lancashire
Volume: 8b
Page: 30

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England & Wales, FreeBMD Birth Index, 1837-1915
about Catherine Turnbull
Name: Catherine Turnbull
Year of Registration: 1861
Quarter of Registration: Jan-Feb-Mar
District: Liverpool (1837-1934)
County: Lancashire
Volume: 8b
Page: 140

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John Turnbull's mother, Margaret nee Cregeen b 1795 Rus, was a sister of John's Aunt Isabella Clague nee Cregeen. The following list takes you back a generation.

Results for: Any Event, 1770 - 1810, Isle of Man, British Isles
Father: William Cregeen, Mother: Catherine Kelly
Exact Spelling: Off
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International Genealogical Index / British Isles - 4
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1. JANE CREJEEN - International Genealogical Index
Gender: Female Christening: 29 OCT 1797 Kirk Rushen, Isle Of Man, England

2. ISABEL CREJEEN - International Genealogical Index
Gender: Female Christening: 13 NOV 1791 Kirk Rushen, Isle Of Man, England

3. MARGT CREJEEN - International Genealogical Index
Gender: Female Christening: 06 APR 1795 Kirk Rushen, Isle Of Man, England

4. CATHARINE CREJEEN - International Genealogical Index
Gender: Female Christening: 05 JUL 1801 Kirk Rushen, Isle Of Man, England

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The Turnbull family is interesting in that a Thomas Turnbull b 1762 came over to the IOM from England (Northumberland ?). He married Margaret Smith b 1763 and they had about 10 children, several of whom also produced lots of children. I suspect that most, if not all, of the Manx Turnbulls in 1841 originate from this Thomas b 1762.

Jean C