This is Ancestry's transcription of John Mylrea's entry in the 1851 census:
1851 Isle of Man Census
about John Mulvea
Name: John Mulvea
Age: 32
Estimated birth year: abt 1819
Where born: Douglas, Isle of Man, Isle of Man
Relation: Head
Spouse's name: Jane Mylrea
Gender: Male
Civil Parish or Township: Conchan
Town: Douglas
County/Island: Isle of Man
Country: Isle of Man
Street address: View image
Condition as to marriage: View image
Occupation: View image
Disability: View image
Registration district: Isle of Man
ED, institution, or vessel: 9
Neighbors: View others on page
Household schedule number: 11
Household Members: Name Age
John Mulvea 32
Jane Mylrea 33
John Allen Mylrea 2
Gregory Alexander Page 33
Jane Corwade 22
Ellen Hancen 14
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"Where born" looks much more like Lonan than Douglas though.
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In 1861 and 1871 his birth parish is given as Lonan. (1861 transcribed as Myhra)
In 1881 his birth parish is given as Douglas; however, the additional information that he is now blind and has a sick nurse staying in the house might suggest that he perhaps had no input in stating his birth parish (ie was he too ill ?)
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John was hard to find in 1841 ---- he turned out to be a 22 yr old book binder in Liverpool:
1841 England Census
about John Mylrew
Name: John Mylrew
Age: 22
Estimated birth year: abt 1819
Gender: Male
Where born: Isle of Man, Isle of Man
Civil Parish: Liverpool
Hundred: Liverpool
County/Island: Lancashire
Country: England
Street address:
Occupation: View image
Registration district: Liverpool
Sub-registration district: Mount Pleasant
Neighbors: View others on page
Household Members: Name Age
William Mylrew 35
Ellen Mylrew 32
William Mylrew 10
John Mylrew 22
35 yr old William was probably his brother (he was a saddler)
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So this is the most likely baptism for John, and this one did have an older brother, William, of the right age in 1841:
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JOHN MYLREA Pedigree
Male
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Event(s):
Birth:
Christening: 16 AUG 1818 Lonan, Isle Of Man, England
Death:
Burial:
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Parents:
Father: THOMAS MYLREA Family
Mother: ELIZTH COWIN
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Messages:
Extracted birth or christening record for the locality listed in the record. The source records are usually arranged chronologically by the birth or christening date.
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Children of Thomas Mylrea and Eliz Cowin:
1. PHILIP MYLREA - International Genealogical Index
Gender: Male Christening: 19 FEB 1809 Lonan, Isle Of Man, England
2. THOMAS MYLREA - International Genealogical Index
Gender: Male Christening: 21 AUG 1803 Lonan, Isle Of Man, England
3. WILLIAM MYLREA - International Genealogical Index
Gender: Male Christening: 04 AUG 1805 Lonan, Isle Of Man, England
4. JOHN MYLREA - International Genealogical Index
Gender: Male Christening: 16 AUG 1818 Lonan, Isle Of Man, England
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In 1841, Factory Lane, Douglas, there's a Thomas Mylrea, 65 yr old tailor, with Elizabeth 60 (transcribed Myhre) plus others with different surnames in same house. Perhaps these could be John's parents ?
Jean C