My wife went to Cobleskill School with Katherine Grenstad. Her father is the one you are asking about. He also had a son, which my wife thinks died. Katherine(1st) married Margan Almy. Then married a Sullivan(He was a cop for Cobleskill). Katherine had a home on Elm St. Don't know where she is now. Check with the Cobleskill post office or the village office. Hope this will help a little.