marriage:
KEARNS, John 8 Jul 1880 D A2 98 GAGAN, Margaret
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In 1881 census, Margaret was a 29 yr old net weaver born in Peel, and John was a fisherman age 27 born in Michael.
The 1882 Castletown birth looks as though it was to a Manx family, not a family from the mainland or beyond.
Are you sure you've got the right birthplace for your g g grandfather Kearns ?
Jean C