+---------------------------            +---------------------------            +---------------------------
          | VAN DER HORST             |           | VAN DER HORST             |           | VAN DER HORST             |
  I       | Jan                       | +-II------+ Johannes                  | +---------+ Johanna                   |
          | * 15-02-1871 Sneek        | |         | * 02-11-1901 Amsterdam    | |         | * 25-08-1934 Amsterdam    |
          | + 26-02-1921 Amsterdam    | |         | + 23-05-1993 Amsterdam    | |         |                           |
           ---------------------------- |          ---------------------------- |          ----------------------------
            x 08-08-1894 Amsterdam------+           x 04-07-1931 Amsterdam------+
          +---------------------------            +---------------------------  |         +---------------------------
          | CIJS                      |           | SURIG                     | |         | VAN DER HORST             |
          | Anna Elizabet             |           | Elisabeth Alberdina       | +---------+ Hendrika Alida            |
          | * 09-02-1875 Amsterdam    |           | * 14-01-1905 Amsterdam    |           | * 04-06-1945 Groningen    |
          | + 11-12-1955 Amsterdam    |           | + 15-08-1981 Amsterdam    |           |                           |
           ----------------------------            ----------------------------            ----------------------------