The Margaret Costelloe that married Burke from Nutgrove was born in 1881, Father James, mother Margaret Mary Martin. Margaret Costelloe from Leitrimmore is the sister of Delia Kennedy, but was still unmarried and at home in Leitrimmore in 1901 census. Burke and his Margaret married in 1897 .
This other James Costelloe and Margret Mary Costelloe nee Martin was from Burrogue, also East Galway, Woodford area.
I have family still in Leitrimmore,
Thanks
MacO