Wow! Really? Thanks a million, Anne.
The more I look, the more I think this is the right way to put the puzzle together. There are still some square pegs that don't quite fit the round holes, but maybe they will fall into place soon.
This means that my Grants would relate to the Duldreggan Grants after all. Just in a different way than we first thought.
Do you happen to know whether Alexander and Marjory actually came to America and to Charlottenburgh? From the way the stone is written, it could simply be a tribute to grandparents who remained in Scotland.