 1939 - 1910
 1939 - 1910( = Descendancy chart to this point,
 = Descendancy chart to this point,  = Expand,
 = Expand,  = Collapse)
 = Collapse)
 John Leverett Gertridge  b. 13 Sep 1936 d. 3 Jan 1907
  John Leverett Gertridge  b. 13 Sep 1936 d. 3 Jan 1907 b. 1856 d. 1942
 b. 1856 d. 1942
                 b. 1859 d. 1942
 b. 1859 d. 1942
                 b. 1861 d. 1890
 b. 1861 d. 1890
                 b. 1865 d. 1905
 b. 1865 d. 1905
                 b. 1868 d. 1869
 b. 1868 d. 1869
                 b. 1868 d. 1939
 b. 1868 d. 1939
                 b. 1871 d. 1952
 b. 1871 d. 1952
                 b. 4 Dec 1872 d. 22 Jun 1951
 b. 4 Dec 1872 d. 22 Jun 1951
                     Laura Ella Armstrong  b. 23 Mar 1875 d. 4 Apr 1957
  Laura Ella Armstrong  b. 23 Mar 1875 d. 4 Apr 1957 b. 12 May 1901 d. 11 Jan 1985
 b. 12 May 1901 d. 11 Jan 1985
                                     b. 28 May 1902 d. 26 Jan 1998
 b. 28 May 1902 d. 26 Jan 1998
                                     James Murray MacKenzie  b. 16 Jan 1910
  James Murray MacKenzie  b. 16 Jan 1910   b. 16 Aug 1933
 b. 16 Aug 1933  
                                                 b. 22 Oct 1935
 b. 22 Oct 1935  
                                                 b. 2 Feb 1942 d. 18 Mar 1967
 b. 2 Feb 1942 d. 18 Mar 1967
                                                 b. 27 Jul 1906 d. 13 Sep 1994
 b. 27 Jul 1906 d. 13 Sep 1994
                                     b. 31 Jan 1915 d. 14 Jul 1981
 b. 31 Jan 1915 d. 14 Jul 1981
                                     Celia Curzon Helsby  b. 22 Feb 1915 d. 9 Feb 2007
  Celia Curzon Helsby  b. 22 Feb 1915 d. 9 Feb 2007 b. 1940 d. 28 Dec 2021
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 b. 1940 d. 28 Dec 2021
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