What I have in the Book of McKee, taken from the Annals of Pennsylvania, Vol 2, Pages 261, 262 is
David McKee, wife Margaret, children John, Thomas, Robert, David Jr, Mary, Margaret and James.
From his research, correspondence and such, the author Raymond W McKee "from the very sketchy Family Tree I have been able to prepare for this sept, it will be seen that David McKee's immediate family seems to have be constituted thus:- David McKee, wife Margaret. John, Thomas, Robert, David Jr, Elizabeth and Mary.
His will mentions John, his wife Margaret, Robert and his children David, Robert; son David (and his children James, Sarah John and David); James, daughter Mary, daughter Margaret.
This was from the 1954 publication Book of McKee-maybe research that came to lite later revealed something else....