Cornelis was the son of Jan (Joannes) (Voozent) Voorend and Gerrigje (van de) Kleij. The date and place of his birth have not been found.
He has died but the date and place are unknown.
His wife was Maria van Heijningen. They were married, but the date and place have not been found. Their five known children were Wilhelmus (Voorend) (1804-?), Frederica (Fredrika) (Voorend) (1806-?), Marrigje (Maria) (Voorend) (1814-?), Dirkje (Voorend) (1819-?) and Adriana (Voorend) (1822-1857).
| Event | Date | Details | Source | Multimedia | Notes |
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| Death |