Rob - I think I've got the connection between your Archbald Mahadys and my Olyphant Mahadys. Your great grandfather Martin (father of Robert and Daniel) was the brother of my great grandmother Catherine (Mahady) Reap. Their father, Martin, was born in Mayo in 1832. I think this makes us second cousins. I'd love to share information with you -- please email me at firstname.lastname@example.org. Thanks!