Individual Details
Helena de Cocq
( - )
Families
| Father | Pieter de Cocq ( - ) |
| Mother | Johanna Catharina van Leeuwen (1854 - 1901) |
| Sibling | Jacob Cornelis de Cocq ( - ) |
| Sibling | Dirk Pieter de Cocq ( - ) |
| Sibling | Pieter Cornelis de Cocq ( - ) |
| Sibling | Dina de Cocq ( - ) |
| Sibling | Cornelia de Cocq ( - ) |
| Sibling | Cornelis de Cocq ( - ) |
| Sibling | Adriana de Cocq ( - ) |