Looking for the Gilrain family in Leitrim. Fanny Gilrain is found living with her husband of one year Peter O'Brien in Longford (1911 census) but says she was born leitrim.
I think I can help you with some information (if it's not too late as I've only just found this site). I'm a bit foggy on some names and dates. Peter O'Brien of Drumlish was my grandfather. I never knew Fannie as she died long before I was born.
Frances (Fannie) Gilrain ( I think from Mohill) was married to Peter O'Brien, postman from Drumlish, and they lived in Currabawn, Drumlish. They had 5 children: Mary (born 1912) followed by Patrick, Kathleen, Bernard, and Elizabeth (Lily).
Frances died apparently from pneumonia at around the age of 50, so therefore about 1928.
Mary who was the eldest child of Fannie and Peter, married William McClelland of Kilbeggan, Westmeath, in Dublin in 1939 but lived afterwards in Kilbeggan. They had 3 children, a girl and then two boys. Mary's husband died in 1955. Her father, Peter O'Brien, moved to Kilbeggan around the mid-1950s. He died in about 1961. Mary lived on in Kilbeggan until her death in 1980.
Patrick and Kathleen both moved to London where they settled. Pat married Bridie McHale from County Mayo. They had 2 children, a girl and a boy, and lived for many years in Woodgreen, North London.
Kathleen married an Englishman. They had one child, a son, and lived in Peckham, South London.
Bernard was said to have run away to the USA when he was around 18 years old, and nothing further was heard from him until around 2003 a man claiming to be the son of Bernard made contact with one of the London family members. This man said his father - Bernard O'Brien - had survived the 2nd world war and lived in Michigan, USA. Bernard died aged around 80.
Lily, the youngest of the family, left Drumlish around 1954 I believe, and also settled in London. She married an Englishman - Harry Coutts - and had 2 daughters.
I hope this is helpful to you.