I have been searching forever, too, for parents of Samuel McKee, wife Margaret, who lived in Westmorland Co., Hempfield Twp, Pa. and died there about ae 45 with 6 minor kids. There is definitely an Alexander McKee there in the late half of 1700's.
He is, I think, a cousin of the McKeesport bunch, all used the same first names, and had a David.
We have no Charles, tho. I believe Samuels father was a Robert, bro of David. I think they came from Ireland. Have you ever checked ship lists from there in the 1700's? Sams bro was a neighbor and Robert. Sam's son, Samuel, also stayed in Westmorland all his life. His James and wife, Margaret Pierce, went to Ill. Don't suppose I could be lucky enough that any of this sounds familiar. Thanks, Donna in Kans.