Yes, you are right Ira Jr, and my Great great grandfather William were brothers. I swapped emails with a Mcgilvrey a few years ago who lived in Seattle (or someplace close). He posted the following youtube video: http://www.youtube.com/watch?v=95cdV6chqPI
It is a video of his search in Perkins, Oklahoma cemetery for I believe his grandfather Linza E McGilvrey. I believe this is the same Linza (son of Ira Jr) that you are talking about. Is this gentleman a relative of yours? We made some brief email exchanges and then that was it. I see the kids of Linza and Flora Frazier end up in California, Washington, Oklahoma and even NY.
There are three parts to the Yoy tube. Perhaps you've seen it.