Since John was with the Davidson family in 1841 and 1851, and since the IGI has no baptism for a John Dumbell circa 1830, I tried John Davidson, and, Hey Presto !

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JOHN DAVIDSON Pedigree
Male

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Event(s):
Birth:
Christening: 21 FEB 1830 Kirk Rushen, Isle Of Man, England

Death:
Burial:

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Parents:
Father: JOHN DUMBELL Family
Mother: JANE DAVIDSON

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Messages:
Extracted birth or christening record for the locality listed in the record

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Jean C