That's correct, Everette. I went to bed shortly after I had responded to you at 10:42 p.m. and was doing hospital rounds at 6:30 this morning. Most professionals work at more than one job.
Genealogy research takes hours of time even when there is sufficient information to begin a search. So far all we have is a name and that he may have been born in Co. Cavan at some time in history and may have come to Canada in 1812. Of course, that means that he was born before 1812.
However, i've spent the past several hours looking for records of your family. If records exist online I have access to them. There is no online marriage record for XXXXX XXXXX and Mary Anne Wilson in Cavan or elsewhere in Ireland at any time that would have produced children prior to the 1840s. Civil registration of marriages and births was not required until 1864. Prior to that all that is available is parish records, and all of those have not been transcribed and put online. Transcription and digitization is a tedious and expensive process. There were a number of XXXXX XXXXXs born all over Ireland, but with no approximate date of birth, there is no way to tell which one might be him. If there were a marriage record, that could help pin it down, but there isn't.
You mention that he came from Lethan in Co. Cavan, but there is no such place on the map of Cavan. There is the Ath Lethan racecourse in Co. Leith, but I didn't find XXXXX XXXXX or Mary Anne Wilson in Co. Leith or elsewhere in Ireland either.
There is nothing more that can be done with the information you have provided. For on site research in Ireland you can contact www.apgen.org or www.progenealogists.com. Fees for on site research vary all over the map from as little as $75 USD per hour to over $150 so it pays to negotiate, especially since genealogists are paid whether they find records or not, based on the information provided by the customer. It is sort of like paying someone to mine your gold claim. If they don't find gold ore, you still owe them for their work. It is not their fault if records aren't where they are supposed to be, or if they no longer exist.
Since you are just beginning your family history, I would suggest you start, as all historians must, with the most recent generation and work backward generation by generation. For instance, there may be some mention in wills, etc. in Canada of George's family still in Ireland. However, those records are also not online.