The last member of that family to live there is dead for many decades, my grandfather's uncle Michael Flanagan. He was already 62 years old in 1948 when he inherited the very small (18 acres) farm from his mother Margaret whose husband Edward Flanagan died prior to the 1911 Census. He was my own grandfather's grandfather. The 1901 Census lists him as a tenant farmer, which meant the land was owned by a landlord, but in the process of land reform a few years later the Flanagans had gained ownership of the farm themselves by the time of the 1911 Census.
These are from the 1901 and 1911 Censuses held under British rule.
The 1901 Census details for Cloonmullin lists Edward Flanagan as the head of the family, aged 70, a tenant farmer by occupation. His wife Margaret was aged 60. Both were listed as speaking Irish as well as English, since Roscommon was then undergoing a linguistic transition from Irish to English. But their children did not speak Irish. The children were Mary aged 20, a farmer's daughter, Honoria aged 18, a farmer's daughter, Thomas aged 16, a farm labourer, Michael aged 14, a scholar or school-child, and JAMES aged 10, also listed as a scholar, who was my grandfather's father.
By the time of the 1911 Census Edward is dead and both Mary and Thomas have left Cloonmullin. Moreover, Norah is the version of her name now used by Honoria. And my great-great-grandmother Margaret has taken six years off her age! The 1911 occupants of the Flanagan home are Margaret aged 64, a widowed head of family and farmer, and her children, Norah aged 27, Michael aged 22, a farmer's son, and JAMES aged 19, also listed as a farmer's son.
My grandfather Andrew got a distant cousin TERENCE/TERRY FLANAGAN from Dublin who joined too in The International Brigades. Terence dead for about ten years.
If anyone know something, please contact to me Thank you Olga G. Flanagan firstname.lastname@example.org