Christine,the only info that I have regarding George McKee in PA is as follows:
1798 George McKee mar Elizabeth Gregg on 1 Nov 1798 in First Pres. Church of Carlisle twp Cumberland County PA . West of Lower Susquehanna R
1802 George McKee of Allegheny County property transfer from W, Stephens. Also transfer from H. McCordey in 1811.Thomas McKee to James McKee in 1802.Margaret McKee to Alexander Snodgrass, John H. Redick,and to Alexander Swan in 1802.
1826 Samuel McKee of Armstrong County had died by Apl 1826.On 22 Sep, 1826 George T. Crawford named admin of estate. Mar to Jane xxx and had minor children under 14 incl George, Jane, Nancy. Charles Bovard appt guardianAlso had land in Allegheny County
1840 George McKee of Allegheny County property transfer from G. McKee