+———Thomas DELAHUNT (1823 Ontario, Canada – 14 Jan 1892)
  |    
  William DELAHUNT (12 Feb 1849 Ontario, Canada – 28 Sep 1925 Himsworth, Parry Sound, Ontario, Canada)
  |        
  |   +———John OLIVE (1788 Borriskane, Ireland – 27 Apr 1867)
  |   |
  +———Elizabeth OLIVE (1824 Ireland – 26 Feb 1900 Fitzroy, Ontario, Canada)
      |        
      |   +———William CAVANAGH (1759 Tipperary, Ireland – abt 1819 Tipperary, Ireland)
      |   |
      +———Mary CAVANAGH (abt 1800 Tipperary, Ireland – 16 Oct 1867 Huntley, Ontario, Canada)
          |    
          +———Elizabeth “Eliza” DONNELLY (abt 1769 Tipperary, Ireland – abt 1829 Tipperary, Ireland)