I'm just been perusing Ancestry trees and I've found multiple trees about the same John O'Neill. Apparently he was born to Joanna Flaherty and William O'Neill in Tralee and remarried after Julia's death. Most interestingly he seemed to spend parts of his life bobbing between Ireland, Australia and England.
That is just silly. You would be a lot less confused if you stop looking at Ancestry trees.
Debra 
I was obviously cautious about it, so did try and track down the original person who compiled this, since it's an infection that's spread to many trees. One person I messaged said they didn't even know about any O'Neills and that they must have just blanket copied all the information. With that level of cautiousness, no wonder they've managed to rack up over 63000 people on their tree. Anyway, at least I was right to hold out from changing any established information on my tree and my Wikitree.
It's just frustrating that people can be so careless. In my view, genealogy should be treated as sacred. Here I am spending a week or more just to establish one generation as best I can, and there are some spending thirty seconds on it.