Salome,
My grandfather and Seamus' mother were brother and sister. I would be Fionnghuala's second cousin. Seamus' mother was Sara Reilly (1861-1924). I grew up sharing much of my early life with the O'Connor's (Seamus' sisters) who lived in the San Francisco area of California, USA. I have many pictures of them (including one taken at my wedding with Anne, Sally and Bridget) sitting side by side. They are all buried at Holy Cross Cemetery in Colma, California. My records of Seamus' family shows six children: Sorca Marie (1912-1974), Fiacra (1913-1933), Fionnuala (1915-1995), Colm (1920-2002) Caoimhe (1922 -1926), Eibhin (1924-2003). I have the names of two of Fionnghuala's three children. Are they all still living? I am interested in any information you have that you would like to share and would be happy to share what I have or do research for you. David, who you directed your first reply to, is a direct descendant of the O'Connor side of the family. He is very interested in researching and sharing his family history, too.
There was a reunion of the family held in 2000 in Dublin and a book of family history written by our cousin, Marie, was shared with all in attendance. If you are interested she has offered to send you the information she has about your part of the family history. She would need an e-mail address to send it to. Mattie Mae