Leitrim-Roscommon

Looking for Aunts, Uncles and Cousins from Roscommon. My grandfather was Patrick Monahan he was born 03-17-1876.
He came to U.S.A. in 1906. He married Johanna or Josephine
Gleeson or Gleason. My G-Grandparents maybe James Monahan
and Catherine Regan. Any info would be greatly appreciated.