Susanne, nice to meet you again on the BB

This Dougherty may be of use to you (if not then maybe someone else)

Margaret Dougherty bp 1 Nov 1796 Bride d/o William Dougherty & Margaret Kneen married 9 June 1821 at Andreas to William Qualtrough (His second wife)

William Qualtrough was bn abt 1778 Rushen s/o Joseph Qualtrough and Joney Cubbon

William Q & Margaret Dougherty had 3 sons
John Q bpt 24 June 1822 Rushen
Joseph bpt 24 Aug 1823 Rushen (note: This Joseph is the grandfather of Sir Joseph Davidson Qualtrough - MHK & SHK)
Thomas bpt 25 Mar 1825 Rushen

Margaret Dougherty Qualtrough died February 1841 Rushen and buried there 4 Feb 1841
William Qualtrough died at Corvalla, Rushen 9 November 1864 and buried Rushen 12 November 1864

Hope that is of interest. I have more info (descendants) if interested

Elizabeth, Australia.