Query about the Kilduff and Mulvey Families in Athleague area

My name is Brian McMurdo. I'm trying to track down information about my father's family, whose names were Kilduff and Mulveyand who may have lived in the Athleague area of Roscommon at least in the late early 1800's. A Margaret Mulvey, born about 1798 in Athleague was the great grandmother of my father. She married a Patrick Kilduff, of who no information is known.

I am trying to figure out her family in the Athleague region, if at all possible.

Margaret Mulvey Kilduff died in 1878 in Sonora, Tuolumne County in California's gold country and is buried in our family burial plot there. Her headstone states that she was a native of Athleague.

She had at least one child, Mary (Mariae) Kilduff, who married a George Banahan.

I'm curious to know if there are further records or information about these people, and where I might look?

I assume she came to America with the family of her daugher and / or other children. They, the Banahans /Mellynns immigrated to the US in the early to mid 1850's, and came west to California, settling the Gold Country of the Sierra Nevada mountain range. They are buried in Sonora and Columbia, both old gold mining towns in Tuolumne County, California.

Any information, suggestions or guidance you could provide would be appreciated.

I enjoy your site. Thanks for any help.

Best wishes,