Wow - that is good news - that you know Mary Flannery’s sister Margaret was baptized in Bohola, Gallen, County Mayo, Ireland.
You ask if I’m related to this family - not at all - just a random helper, as with most responders on GenForum. I see now that you weren’t asking volunteers to help you find further records. You were giving a shout out to the family in case someone else had done research already or had family knowledge to add to yours. Nonetheless I did search a bit for you - got nada sorry.