I have a family tree showing Captain John Nelligan and Patrick Nelligan married to two sisters, Margaret Kieley and Catherine Keiley. The Keiley sisters' parents are listed as David and Mark Keiley, of Waterford Ireland. Teh family tree does not indicate if Patrick and John are brothers.
I would be pleased to send you a pdf version of the "Keiley Nelligan Kilroy Cassidy" family tree. My family appears at the bottom under Bartley Edmund Nelligan. We are in Ontario. If you would like a copy email at email@example.com. Please identify Nelligan Genealogy in the Subject line.