I'm not sure how long ago I posted all those messages, but much of it was wrong.
My family was not related to the McKinneys who had the hardware or lock company or whatever it was. Nor were we related to the Titusville McKinneys.
As or the Alamo, I happened to notice a Robert McKinney listed among the dead there when I was stationed in San Antonio. As far as I know, he was a Tennessee volunteer and no relation. (But I, too, was a Davy Crockett fan in my younger days).
Sorry for all the earlier misinformation; I was struggling with a lot of bad info that had been passed down and had to weed my way through it.
As best I can tell from documents, the William who brought his family to the U.S. from Donegal to Braddock's Field, Pa., in 1820 (or 1822) was born in Ireland about 1776. He was married to a Martha. His sons were John (my line) and Robert, and the had three daughters: Sarah, Mary and Nancy.
Now, his daughter Mary married a Samuel McKinney for whom I have no information. I also find it interesting that they immigrated all the way from Donegal and settled in an area where several McKinney families already lived, some for decades. It leads me to believe there was some relationships (hopefully not too close in Mary's and Sam's case, though).
Anyway, thought I'd clarify what I'd written earlier. Our computer has been down quite a while; crashed and we lost all of our older material. We have a new computer now and are still hoping to salvage the old hard drive.
Take care. If you happen upon any linkages or stories of the more established McKinneys sending for my branch, please let me know. I'll keep you apprised of any new findings from my end.