I wonder if it's because she wasn't sent to Pennsylvania to be buried....hmmm.
Or it could be about a legacy. It's incredible the way families can fall out about something like a teapot that one of them expected to get and didn't! You know the "I always admired that teapot and Ellie said it would come to me when she was gone and then Ellie's daughter never mentioned it - and of course I didn't say anything. I mean everybody knew that Ellie's rose trellis teapot was to come to me. I was so disgusted - I made up my mind that I'd never speak to her again and I never have!"
The surname is normally spelled O'Brien, so the O'Bryan spelling must have been a help in your research as it narrows the field down a bit. Whereabouts did he come from in Ireland?? Which county? You know it's derived from King Brian Boru from whom about half the men in Ireland are descended, I'm not joking, it's true. I'm descended from his brother, through my maternal grandmother, so that makes you and me very distant cousins of a sort :))
Do you have the common red hair, blue eyes, and freckles?
Red hair is not actually that common in Ireland, the commonest colour is plain old brown, but I have the blue eyes. Also the freckles aren't quite as common as you might imagine, but Irish people do tend to be very pale.