Might have been an American tree with the maiden name inserted as a middle name. I hate the way they do that.
EBENEZAR ANNAN/MARGARET LOW
ROBERT ANNAN/ANN DEWAR FR3341
John Hancock (1818 Burslem, Staffordshire – d. 4 Feb 1904 Port Willunga, SA) - married 1839 Staffordshire to Jemima Brough (1819 Staffordshire – d. 18 Oct 1892 Inman Hills, SA ). They left UK 14 Dec 1840 on 'Fairfield' to SA.
They both died in South Australia.
I can't find the marriage...