A look at the Gordon Family Tree 3 and Tree 3a will reveal four marriages between Gordons and Crawfords or Sharman-Crawfords.
John Crawford married Jane Crawford who is believed to have been his first cousin.
Robert GORDON b1722 d1793 mMar 1755 Alice Whyte dau of James Arbuckle by his wife Anne Crawford, daughter of John Crawford and neice and heir at law of David Crawford of Florida Co. Down.
Their son:
David GORDON b1 Jun 1759 d2 Mar 1837 m11 Sept 1789 Mary eldest dau of James Crawford
Their son:
Robert GORDON b8 Sep 1791 m25 Aug 1825 Mary dau of William Crawford (of Cork)
Robert Gordon's nephew marries Mary's neice:
Robert Francis GORDON b9 Feb 1847 d12 May 1911 m16 Jan 1879, Alice Aimee Sharman-Crawford
Along the way there are incidences of the GORDONs marrying amongst themselves, not least of which is Alice Mary Dorothea, the daughter of Robert Francis GORDON and Alice Aimee SHARMAN-CRAWFORD above, who married her first cousin, Alexander Robert Gisbourne GORDON