1944-1978
| Hendrik Cornelis Los | |
| B: | 27 Apr 1944 |
| Voorschoten, Zuid-Holland, The Netherlands | |
| D: | 18 Feb 1978 |
| Loosdrecht, Noord-Holland, The Netherlands | |
1914-1982
| Martinus Los | |
| B: | 06 Feb 1914 |
| Leiden | |
| D: | 16 Oct 1982 |
| Haarlem, Noord Holland, The Netherlands | |
1915-2001
| Roberta Hermina van der Helden | |
| B: | 10 May 1915 |
| Duisburg, Germany | |
| M: | 17 Jun 1942 |
| Voorschoten, Zuid-Holland, The Netherlands | |
| D: | 16 Jul 2001 |
| Haarlem, Noord Holland, The Netherlands | |
1882-1966
| Jacoba de Graaf | |
| B: | 27 Aug 1882 |
| Alkmaar, North Holland, The Netherlands | |
| D: | 20 Mar 1966 |
| Voorschoten, Zuid-Holland, The Netherlands | |
1879-1966
| Leendert Johannes Los | |
| B: | 21 Aug 1879 |
| Leiderdorp, Zuid Holland, The Netherlands | |
| M: | 21 Mar 1912 |
| Voorschoten, Zuid-Holland, The Netherlands | |
| D: | 16 Feb 1966 |
| Voorschoten, Zuid-Holland, The Netherlands | |