Hi Emmie,
Looks like your family are related to the Thomas Colsh who married Anne Tyrell and then Margaret Brady and lived in Cloncon. I was hoping that there was a link to Thomas Colsh who married Catherine Gavan (Gavin) and lived in Puttaghan. He was my great grand father. I think that louislou 225 is probably right - the Thomases could be cousins, both marrying within 5 years of each other. Crucially, to verify that link I need to find out the names of the siblings of Thomas and/or of William, his father. Uptil now I have been unsuccessful.
Thomas and Catherine were marred in 1865 and had 7 children, Thomas, Margaret, William, Catherine, Patrick, Elizabeth and Annie, my grandmother. She moved to Scotland in 1902/3 after my great grandfather Thomas's death in 1902. Thomas, my great grandfather was born around 1832 in Tullamore.