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The one thing I am missing is Patrick Mitchells birth.
I know he was born in St. Thomas parish, in 1870, and I think he was baptized in the old St. Thomas Church on Marlborough Street. I cannot find any birth or baptismal records for that church, so maybe they no longer exist? I seem to have hit a brick wall on this one!
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St. Thomas' Church of Ireland was destroyed during the Civil war along with many of the records, most of the surviving records are on IrishGeneaology - some burn damage can be seen in the registers online. A replacement church was built on a new Street built later, Cathal Brugha Street.
I see that his marriage was in a Catholic Church,
does some reference suggest Church of Ireland family ? added : I see the military record service no. 8284 which mention Unitarian as Religion when joining up.
Some sources e.g. military records can give Civil Parish as the reported place of birth, which would fit that area but come under St.. Mary's (Pro-Cathedral) Catholic parish for baptisms etc.