I didn't know, so I went to both Geni.com and WikiTree to find out.
1) On Geni.com, they found a relationship as 16th cousins:
The common ancestors are: William Keith, 1st Earl Marischal (1425-1482) and his wife, Mariotta Muriella Erskine (1430-1482). My line goes through the Keith, Tullibardene, Rishford, Boithes, Best and Shaw families to Abraham Tucker (1653-1725) of Dartmouth, Mass. I don't know if Martha Shaw was them other of Abraham Tucker or not. If she wasn't then my line back to the Keith couple is inaccurate.
So, Geni.com is a MAYBE.
2) On WikiTree, they found no matches in a blood relationship, and no matches in a marriage or adoption within 10 steps.
So, WikiTree is a NO.
3) I'm afraid that I will have to tell my grandchildren that I don't think we are related to Donald Trump. It's OK, the grandsons weren't big fans of The Donald anyway!
I wonder if we're related to Hillary (Rodham) Clinton? Tune in Next week!