I have a baptism record for their son Matthew McDermott born March 4, 1849 in Perth County. He died July 11, 1860 in Chepstow, Bruce County Ontario. He may have been their first born, not sure. My source of this information didn't have documentation, so not sure where he got this information.
I show Ann Phelan was the daughter of John Phelan 1781-1847 (I suspect he died in Ontario also) and Susana Whittaker 1781-1865.
Any information would be so appreciated!!!