Peter, Edward and John Patrick all joined the British Army from the Hibernian Military School in Dublin. I believe based on army payroll records that their father Patrick Gavin also joined the British Army. Peter joined the army in 1811 in Gibraltar. Edward and John Patrick were born in Nenagh, Tipperary and were also at the Hibernian Military School as children before joining the army in 1818 per their British military records. I am currently trying to find out any more info that might be listed for Edward and John Patrick under the school, but haven't had any luck. I don't know if they kept copies of the school records in Ireland at all?