Sorry to be so late to the party! I see this thread started over a decade ago.
My grandfather Harry, that my uncle mentioned above (his dad), the grandson of Michael Margey, passed away April 2, 2018.
I'm the oldest of the 4 grandkids, 3 by my mom, 1 by my uncle.
So assembling the data, I guess we are somewhere along the lines of fourth cousins. Hopefully I can think of a good third post to make since I'd like to know additional information you may have on Michael Margey's dad, and especially if you have ancestry above Michael's parents. Before this thread, I only knew his mom's maiden name from the death certificate info.