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I searched on Roots Ireland and Find My Past and did not find possible baptismal records for Catherine and Bridget.
The Griffiths Valuation was conducted in Co. Tipperary around 1850. I don't know if Patrick Horan was alive and leasing land but if he was he may be one of the seven listed below.
Let me know if you have any questions. You may want to consider autosomal DNA testing.
GriffithHoranPatrickGalbertstown LowerFertianaCo. Tipperary
GriffithHoranPatrickGarryard EastKilmoreCo. Tipperary
GriffithHoranPatrickT/nenagh/dublin RoadNenaghCo. Tipperary
GriffithHornPatrickCarrickloughmoreLoughmoe WestCo. Tipperary