I see where you were kin to John Costello & Catherine Donahue. They had several children but the one I am trying to track down is Nellie Ellen who married John E Agnew of Waterbury, CT in Great Barrington, MA on 24 Aug 1882. John & Nellie lived in Waterbury, CT at 15 Orange St. 490 & 492 E Main St. John Died in Oct 1892 & Nellie Ellen died in 1923. Both are buried in Waterbury Old St. Joseph Cemetery.
I can find anything on John Costello where & When he died & where he is buried. Also, little info on Catherine. Any info would be appreciated. May God Bless!