Looks like I never responded to your inquiry almost four years ago. I had taken another break and then must have missed this message.
I have restarted my search for any leads on my family from Grayson, TX. I think there is part of the story that must be missing.
I reviewed the census from 1900 and I think that it says that William J Fitzgerald says that his parents birthplace was "Unk". Not sure if he found out later that it was Ireland, or if the story evolved.
I am sure that his sisters, Mary and Sally were older. I found a family document that says that Willam was raised by his sisters.
I really appreciate your help in the past, and hoping you are interested in re-exploring this elusive family!