Mulkeen family at Coogue North

My Great Grandmother Sarah Mulkeen was born about 1849. She married Thomas Holian in 1877 and lived at Derrymore, Bekan. She applied for an old age pension in 1920, and a search of the 1851 Census revealed that she was living at the Townland of Coogue North and that she was the daughter of John Mulkeen and Mary.........? The record listed 4 other siblings living in 1851. A sister Anne who would marry Martin McGarry of Cloontumper in 1865. The other siblings: Bridget b. 1837, Honora, b. 1844,Mary b. 1845and Martin b. 1846. Of these siblings, I do not have knowledge of their marriage. I was told that Martin, although the only son, was 'disinherited' because he married an English woman. The land did indeed pass to the husband of a younger sibling, when John passed on. The younger siblings: Ellen b. 1858, married John Feeney in 1879 and became the landholder after John's passing in 1887. The only other sibling I am aware of was Catherine b. 1860, who married Michael McHugh of Kiltimagh in 1882.

John had brothers: Martin b. 1810, who married Bridget Morley; Patrick b. 1815; Michael b. 1818 who married Bridget Kenny I have found some of the descendants of most mentioned heretofore, but I would ideally like to learn the surname of John's wife Mary, whom I believe died in 1882.

Regards Michael Duffy in NY