| Name | Role | Place | Source | |
|---|---|---|---|---|
| Karel Modderaar | Groom | 1937 | Groningen | Civil registration marriages |
| Karel Modderaar | Military | Studbooks | ||
| Karel Modderaar | Decorated | 's-Gravenhage | Registration honors | |
| Karel Modderaar | Child | 1911 | Groningen | Civil registration births |
| Karel Modderaar | Registered | 's-Gravenhage | Studbooks | |
| Karel Modderaar | Registered | 's-Gravenhage | PoW cards | |
| Karel de Modderaar | Registered | 's-Gravenhage | Studbooks |
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