Nessa,
My mah, today, discovered my grandfather's (Edward Molloy) birth certificate, and unless this were to be a series of bizarre coincidences, I believe we are first cousins once removed, and that your mother and my mother Rita are first cousins. We were very much aware that we had lost relatives in the US and are thrilled that we may at last be reunited.
On Edward's certificate, his parents are listed as Patrick Molloy, signal man, and Frances (Fanny) Molloy, nee O'Loughlin. The address listed is St. Bridget's Terrace. The signee is one Mr. Lydon (although I see he is ubiquitous). All of the above match the information posted by Roger.
My great-aunt Kathleen was a nun in England, which is where my grandfather and his wife Evelyn (nee Byrne) moved. My mah, born and raised in Birmingham, married an Italian man, moved back home to Dublin and had myself and my brother.
Edward had two older brothers who moved to the US, one of whom presumably being your grandfather.
The only things which don't seem to check out are the dates of death for Patrick and Fanny, the former echoing Roger's findings. My mother recalled that Patrick had died sometime in the late 1960s, and as my grandfather was born in 1921, Fanny couldn't have died no later than that. Although she does believe that Fanny wasn't very old when she died.
I eagerly await your response. In the meantime, feel free to add me on Facebook or drop me an e-mail: al.molloy@clio.com
P.S. Thanks a million Roger for the follow-up. I wouldn't have been able to know for sure if it weren't for you findings.