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I searched on the subscription site Roots Ireland and the subscription site FindMyPast.ie and did not locate the marriage record for Mary Reddin and Patrick McMahon. I also tried to find possible baptismal records pre-1850 for any children of Mary and Patrick but again no records.
In the mid-19th century, the surname Reddin/Redden/Reddan were mainly found in Co.Tipperary and Co.Clare with a few families in Cork and Limerick.
The other complication is that the surname could have been Reddin, Redden or Reddan. Reddan was more common in Co. Clare. Reddin/Redden more common in Co. Tipperary.
My advice would be to test your DNA and pursue close matches to see if you can establish a Reddan/Reddin/Redden connection which might point to a more specific area in Co. Clare/Co.Tipperary.
Castlemore Roscommon, IrelandXO Volunteer ☘