Hi Keith,
I recently came across a possible source (Ancestry) for my O'Brien family (under the name of Brien). Here are the names of the siblings. Your Jeremiah may be one of them. Are you on any DNA site so that we can see if we are related?
Jack
Margaret, baptized February 5, 1831
Honora, baptized May 10, 1836
Cornelius, baptized March 8, 1839
Denis, baptized April 28, 1842
The parents of each were Bartholomew O達rien and Margaret Lane.
A fifth possible child was Jeremiah, baptized August 21, 1833, also in Bandon. The parents were given as Prut Brien and Margt Laure
Denis could be my great great grandfather. I just came across a Hourihane who shares my haplogroup.