My great great grandfather was Maurice Cahill from around Caherboshina, Ventry, Dingle, Kerry. Don't know if he had any sisters, only know of 2 brothers, Daniel and Patrick. Cahill's have been in that area for centuries. He and wife Elizabeth Shea had the three boys that I know of, around 1820's -1830's. So he had to have been born beginning of 1800's and could have had a sister, who could have been Mary Margaret's mother. If only we knew !!!! Thanks