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The Ahascragh RC records are on Roots Ireland and start in 1840. I was expecting to find baptismal records for some of the younger childfen of the two families but no records came up on my search. Likely, they were baptized in another parish which does not have records back to the 1840s. I also did not locate marriage records for the two couples.
We have an XO Chronicles site https://www.irelandxo.com/ireland-xo/history-and-genealogy/ancestor-data... where you can post stories of your ancestors who left Ireland.
Also, have you considered autosomal DNA testing?