Nice to find a relative here. I saw Sam Mercer at Missoula, MT, a few times as a child. He ran a motor court there in the 1940's and into the '50's. I didn't know other Mercers lived there. I have some photos of Sam circa late 1940's if there are family members who would like to have them. You can email me if you wish. The information I posted came from John McDonald's research. I'd certainly be interested if you have anything more on the Coy side, too.
Thanks, Rhonda Sedgwick Stearns