Said to be a farmer on the marriage records of his children.
There is a Peter Halligan in 1933 Tithe Book in Maynooth, Kilmore, County Armagh. Maynooth is just south of Richhill, where Sarah Anne, Constantia and Samuel lived when they got married in 1851-63. There's a Robert Halligan living in Richhill in Griffiths' Valuation.
Sources
Marriage records of his children Robert, Sarah Anne, Constantia and Samuel
1933 Tithe Applotment Book
Griffith's valuation
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DNA Connections
It may be possible to confirm family relationships with Peter by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Peter: