Hello Cousin
My name is George Plunkett from Bklyn,NY. Julia Plunkett was my grandfather Thomas Plunkett's sister. Their mother was Mary Kelly. When her 1st husband Andrew died in 1888 at 22yrs she remarried John Carey.I never knew your grandmother but I certainly remember your grandfather. As a young boy I often saw him at my grandmother house in brooklyn. My memories of him is that he was the nicest adult ever. Have more info about Julia and may you could give me some more info on Costello so I could check for you.