Hi
I'm afraid to say that you are going about your tree incorrectly.
You will need to go by facts as opposed to family lore.
You need your Mum's birth cert first to get her Mother's CORRECT maiden name.
You will the need to get your Grandparents marriage cert.
ONLY THEN can you even start to look for your Grandfather in Ireland.
Tara
Thanks for your reply. Any advice on locating marriage certificates would be appreciated. They seem to be very hard to find. I have no idea exactly where or when Maude and Jack got married. Interestingly, I know that after Maude and Jack moved to California, they were divorced at some point, and when Maude
died (link) in 1939, she had remarried and was Maude Bassett. I don't know Mr. Bassett's first name, although I have seen a family photo of them together, and am unsure of the dates of either divorce or marriage. And, despite much searching I have been unable to find any records regarding them, which seems odd, and makes me doubly unsure of being able to find any record of Jack and Maude's marriage.
I know exactly where Ballymena and Dungannon are but it's highly unlikely that the 1893 birth is for your Elizabeth Arthurs.
Will do a bit of digging in U.S. records with the details you've posted and see if I can find something on their Irish origins.
The GRO, Roscommon form is really designed for people requesting their own certificate but you can order a cheeper research certificate with just the name, year/quarter, registration district, volume and page numbers. However, you aren't really ready to order anything yet.
Thank you very much. Additional things I have found in U.S. records are: The
1930 Census (link) for Jack and Maude Arthurs, where my mother and her half sister were during the
1920 Census (link), Maude's entry on
Find a Grave (link) (I have been completely unable to find any other death information on her, although I know she died at the Woodland Memorial Hospital in California), and a possible
death entry for Jack Arthurs in 1939(link). I understand that he froze to death while traveling back to Montana to a job after he broke up with Maude.