I am also searching for Brennans of Roscommon. I have John Brennan married Mary Callery of Boyle Roscommon and they moved sometime during the famine and ended up in Peoria, Illinois. They had the following children: James (Sept 25, 1858), John H.(born April 11, 1861 married Julia? in 1918, died March 29, 1935), Mary Ann born March 23, 1862 Married Thomas O'Connor son of John and Magreth Hayes O'Connor also of Peoria, Married April 28, 1886, died May 1937) These were my great great grandparents. Kate Brennan b 2/25/1864, Agnes Brennan b. 8/24/1871, Thomas Brennan born 8/24/1871 married Etta Ryan, Bridget Brennan b 5/15/1873, Emily Elizabeth brennan b. 1/23/1874 died 11/19/1935. John H. and Julia had the following: W. Dean Brennan, Lou J. Brennan, Lucille Brennan, Lorena Brennan, Gerald T. Brennan. Thomas and Etta Ryan had the following: John Brennan(still living) and Lester Brennan. If any of these sound close or possible will you let me know? Thanks