Dear Valerie Long time no hear! If it's any help.I think I've worked out that there were only 2 Costello families on Inisheer. Pat, b. c 1745 who had sons John and Michael. Michael b.c1760,sons John and Tom. Wouldn't be the least bit surprised if they were brothers,and had a father called John,but alas,no proof!! That would mean this Tom,who married a Mary,is most probably yours. Not too many other candidates! Did he die in Ireland,or go with the family to Boston? As you know,there is nothing in the Inisheer graveyard to help. Have you looked for his death in Boston or Maine? Did you find any trace of Michael Costello (presumably Peter's older brother?) in the US? Have you tried the Civil War records? They might have joined the same unit. I am fairly sure the Michael on Inisheer in 1834 is son of Pat,not Tom. Maybe both father and son died on Aran,which precipitated the move to America. Do you have any info.on Mary's death? Do the ages tally? She was supposedly born c 1796. Cathy