De stambomen van elk van onze 4 grootouders (Van de Sanden, van den Hout, Peijs Geerts en Smits, Morée, Gierman en Van Schoonhoven)

| August Johannes de Greef | |
| G: | 13 jul 1913 |
| Elberfeld (Duitsland) | |
| O: | 7 jun 1937 |
| Heerlen | |
| Elisabeth Auguste de Greef | |
| G: | 1 apr 1915 |
| Steele (Duitsland) | |
| Fredericus Antonius de Greef | |
| G: | 7 nov 1944 |
| Hoensbroek | |
| O: | 21 jun 1990 |
| Hoensbroek | |
| Friederich Wilhelm de Greef | |
| G: | 28 jul 1916 |
| Oberhausen (Duitsland) | |
| O: | 16 nov 1981 |
| Brunssum | |
| Cornelia Wilhelmina Johanna van Os | |
| G: | ca. 1916 |
| H: | 30 jan 1943 |
| Bertha Elisabeth Koppelberg | |
| G: | 15 dec 1892 |
| Pisewaag (Duitsland) | |
| O: | 2 apr 1985 |
| Heerlen | |
| Frederik Antonius de Greef | |
| G: | 16 okt 1878 |
| Arnhem | |
| O: | 26 jun 1958 |
| Heerlen | |
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