You have another, for it seems we share the same 5 x great-grandparents, John GAMMIE and Elspet ELDER, daughter of John ELDER & Janet COWIE. I've had look at some of your other postings ... whilst I couldn't find an exact match with them (other than this GAMMIE/ELDER one), we do have some of the same surnames within our REIDFORD tree.
I've been saying Stewart GAMMIE, who also has John & Elspet as 5 x g-gp, is my 5C. I think I erred and he is a 6C. Of course, he would be the same to you. Have you been in touch with Alan MORRISON? Without Alan's generousity of sharing his research, I would most likely not have known about John GAMMIE & Elspet ELDER at this point in time. I do have some further info for him, but have not been able to make contact for quite some time.
There is also a plan to have a REIDFORD Reunion near Edmonton in the summer of 2009. The Alberta REDIFORDs are also direct descendants of John GAMMIE & Elspet ELDER.
Hope to hear from you again!
Toni ~ Ontario Canadaamheater@cogeco.ca