Well, this actually throws a monkey wrench into everything.
See, one of the reasons we ASSUMED that Patrick Flynn was John, Ann, and Owen's brother was because he was living with Patrick Devitt and Ann Flynn Devitt. He was listed as brother-in-law. So I unfortunately presumed that meant he was Ann's brother. Now if you found that Patrick Flynn was married to Patrick Devitt's sister, that means there is a possibility that this Patrick Flynn is not related to my Flynn's. And it was only because of Patrick Flynn's immigration records that I came up with a county. None of the others have a county listed.
I am going to be requesting the marriage records for Patrick Flynn and Ann Devitt from Ireland. That should be able to confirm whether or not Patrick Flynn is related to my Flynn's. If he isn't, then I am back to square 1 with not even knowing what county.