+———John Lauchlin MCDONALD (11 Sep 1861 Alexandria, Ontario, Canada – 1 Oct 1927 Lochiel, Ontario, Canada)
  |    
  Laughlin MCDONALD 
  |            
  |       +———James WEIR (1790 Scotland – 6 Apr 1866 Lochiel, Ontario, Canada)
  |       |
  |   +———John WEIR (26 Apr 1834 Kenyon, Ontario, Canada – bef 21 Jul 1890)
  |   |   |    
  |   |   +———Margaret MACPHERSON (1795 Scotland – )
  |   |
  +———Mary Ann WEIR (7 May 1870 Kenyon, Ontario, Canada – 13 Jan 1936 Alexandria, Ontario, Canada)
      |        
      |   +———Duncan CAMERON (1793 – )
      |   |
      +———Catherine CAMERON (1826 Greenfield, Ontario, Canada – 6 Jan 1897 Greenfield, Ontario, Canada)
          |    
          +———Margaret MCDOUGALD (1803 – 1888)