I doubt it is the same person, as the children are so different. But it is possible that your ancestors are older children. John Henry McKee came to Texas with his sister(s?)in the early 1890's and he was pretty young. I would guess that the father died by that time, but I don't know.Do you have any birth dates for your children of John McKee?
My ancestor was supposed to be cherokee, but the indian story is consistent with our stories. It will just take more research to know for sure. Barbara