+———William MacDonald NICHOLS
      |
  +———William Graham NICHOLS (Edmonton, Alberta, Canada – living)
  |   |        
  |   |   +———John Brownlee “Jack” BROWN (1895 Scotland – 25 Mar 1989 Victoria, British Columbia, Canada)
  |   |   |
  |   +———Mildred Jean BROWN ( – living)
  |       |            
  |       |       +———John MCNABB (11 Dec 1833 Kirkintillock, Dunbartonshire, Scotland – 19 Jul 1879)
  |       |       |
  |       |   +———John MCNABB (27 Oct 1865 Scarborough, Ontario, Canada – 29 Aug 1919 Thornhill, Manitoba, Canada)
  |       |   |   |        
  |       |   |   |   +———Andrew BLAIR
  |       |   |   |   |
  |       |   |   +———Isabella Eliza “Eliza” BLAIR (30 Mar 1828 Scotland – 8 Nov 1910 RM of Pembina, Manitoba, Canada)
  |       |   |       |    
  |       |   |       +———Grizel DOUGLAS
  |       |   |
  |       +———Olga Pearl MCNABB (12 Oct 1897 Thornhill, Manitoba, Canada – 26 Sep 1983 Winnipeg, Manitoba, Canada)
  |           |                
  |           |           +———William (unverified) BOYLE (abt 1770 Ireland – Ireland)
  |           |           |
  |           |       +———Thomas BOYLE (abt 1793 of Ballymodan, County Cork, Ireland – 18 Nov 1846 Pakenham, Ontario, Canada)
  |           |       |   |    
  |           |       |   +———Sophie (unverified) DAVIES
  |           |       |
  |           |   +———William BOYLE (7 Jul 1815 of County Cork, Ireland – 30 Dec 1895 Thornhill, Manitoba, Canada)
  |           |   |   |    
  |           |   |   +———Margaret “Mary” CHECKLEY (abt 1791 of Ireland – 3 Feb 1836 Pakenham, Ontario, Canada)
  |           |   |
  |           +———Janet Ann “Jennie” BOYLE (6 Oct 1868 Huntley Twp, Ontario, Canada – 3 Jan 1918 Thornhill, Manitoba, Canada)
  |               |        
  |               |   +———William WHITEHEAD (abt 1797 Kent, England – 8 Aug 1844 Ottawa, Ontario, Canada)
  |               |   |
  |               +———Sarah Jane WHITEHEAD (7 Jul 1838 USA – 16 Jan 1877 Pakenham, Ontario, Canada)
  |                   |    
  |                   +———Mary Jane PARKER (abt 1805 Waterford, Ireland – 6 Jun 1888 Ottawa, Ontario, Canada)
  |    
  Erin Frances NICHOLS (Vancouver, British Columbia, Canada – living)
  |    
  +———Nadine Frances MARZOCCO ( – living)