In response to your posting Ihave a great great grandmother by the name of Mary Dukelow. She was born in 1834. She came with her family from Ireland to New York before moving to Percy Township in about 1851. She married Charles Beamish in 1852. She died in 1901. Her fathers name was James. They were from County Cork, Ireland.This info may assist as she may have been a sister to your ancestor.