O. von Beckerath, Familie von Beckerath II, Krefeld 1936, S. 33
B. Koerner / O. Praetorius, Darmstädter Geschlechterbuch 2 (DGB 96), Görlitz 1937, S. 685
♥ = Vorfahren Wilhelm LEENDERTZ >
| (1780-1855)x1810
Heinrich LEENDERTZ | Mathilda Agnes Anna Elisabeth METZGES >
| (1817-1882)x1843 (1792-1882)
Friedrich August LEENDERTZ |
| (1850-1921)x1880 | Wilhelm te NEUES >
| | | (1784-1852)x1814
| | Maria Johanna te NEUES | Anna Maria GISBERS
| (1819-1902)x1843 (1791-1860)
Richard LEENDERTZ |
| (1881-1950)x1907 | Johann Peter HEILMANN > ♥
| | | (1778-1864)x1809
| | Karl Richard HEILMANN | Katharina ter MEER > ♥
| | | (1826-....)x1856 (1781-1870)
| | Luisa HEILMANN |
| (1860-1915)x1880 | Abraham SOHMANN >
| | | (1796-....)x1828
| | Maria Elisabeth SOHMANN | Johanna REINERS >
| (1833-....)x1856 (1805-....)
|--Werner LEENDERTZ
| (1909-2006)x1937 Gerhard von BECKERATH > ♥
| | (1784-1840)x1815
| Konrad Wilhelm von BECKERATH | Susanna Regina von BECKERATH >
| | (1820-1905)x1848 (1794-1851)
| Friedrich Wilhelm von BECKERATH |
| | (1858-1890)x1885 | Wilhelm CROUS > ♥
| | | | (1802-1877)x1826
| | | Laura Emilia CROUS | Christiane ALBERTY >
| | (1828-1893)x1848 (1804-1883)
| Martha Emma von BECKERATH |
(1886-1977)x1907 | Friedrich Carl Ludwig SEYFFARDT >
| | (1792-1871)x1834
| Heinrich Carl SEYFFARDT | Maria vom BRUCK >
| | (1837-1907)x1861 (1803-1895)
| Clara SEYFFARDT |
(1866-....)x1885 | Friedrich August KÜCHLER
| | (1799-1866)x1829
| Emma Alwina KÜCHLER | Ida Henriette Alwina BASTIAN
(1841-1920)x1861 (1807-1866)