Thanks to cousin Jim, we now have a copy of the "Montrose letter" mentioned on page 3 of this thread.
The letter didn't make a very strong connection with Montrose - the key part reads - "you certainly seem to be one of her family, all your names are family names but her father was John also; his father was Robert who married Miss Lennox and previously the Baronet Sir Robert Graham who married Lady Lennox".
Crosshands and I have researched the ancestors mentioned in the letter and discussed it with a descendant of the woman who wrote it, in reply to an enquiry from John (bootshop) Graham in 1919. While confirming most of the statements above, we weren't able to identify any obvious baronets or ladies, as far back as 1720, which is as far back as we could go. There is also no apparent family connection between the two families of Grahams.
Nevertheless, there are some interesting aspects to the story, such as the court case that may have sparked John Graham's interest in the first place - and which I've summarised here:
https://drive.google.com/file/d/0By-wnjsdtus1Njh5dGRtUnluelU/view?usp=sharing.
Having read this, you should look carefully at the photo therein and ask yourself "Do I have the Lennox chin?" (which was put forward as a proof of Lennox descendancy). If so, then maybe we are connected to them after all!
