Do you have a local library near you or an LDS research center? You can ask them to locate the 3 volumes of the "Book of McKee". I just did. It is a detailed but confusing compilation. You have to read thru it and write down and decipher stories of who is related to whom. I haven't gone thru other books on McKees but it is strange to me that someone hasn't taken this information and put it into a simplified list or tree format.
I too have Robert and James in my family and am stuck getting past my GG Grandfather Robert T