EdPatLogan made a posting in 2004 about their ancestor James Malarkey who could be a brother to Michael Malarkey of Boston who was born in about 1825. Yes, they could be. Michael's last name is spelled a variety of ways in both Ireland and the US. I found him in Moville, Innishown peninsula of County Donegal and found the house, on Griffith's valuation, where he lived at some time during the years of 1858-64.
If the Logans are still around and would like to share information please contact me.