| Name | Role | Place | Source | |
|---|---|---|---|---|
| Helena Maria de Block | Deceased | 1955 | Grembergen | Prayer card collection |
| Helena Maria de Block | Deceased | 1953 | Hamme | Prayer card collection |
| Helena Zoe Maria De Block | Registered | 1859 | Dendermonde | Population register |
| Maria Helena Joha de Block | Registered | 1903 | Amsterdam | Population register |
| Maria Helena Johanna de Block | Bride | 1930 | Amsterdam | Civil registration marriages |
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