William was born about 1840. He is the son of David Mairs.
On 31 March 1851, the Mairs family lived in Ballyrobin, Killead, County Antrim, Ireland. David Mairs (40) Labourer & with children Jane Mairs (15) Flowerer, William Mairs (11), Andrew (9), Margaret (6), Catherine (5) & David (4)
Sources
1851 United Kingdom Census Sample
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