Hello,
my mother was Eileen Quinlan, youngest daughter of Hannah (nee Mahoney) and John Lawrence Quinlan of Kilcow, Castelisland, Kerry. Hannah was a Sullivan on her mother's side.

many of the names in your post are similar first names in my mothers family. I am pretty certain that either our great grandfathers were related, if I remember the details of your post correctly.
I have also been to Castleisland many times and will be there again next summer.