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Clasina Margaretha ‘Sien’ de la Mar-Klopper (1881-1944) was a Dutch actress.
She was married to actor Nap de la Mar and mother of popular actress, singer and comedienne Fien de la Mar.
Willy, the son of baron Van Hergershuizen, finds himself disinherited after he marries an untitled girl. His wife decides to take action and applies for the job of the baron's housekeeper.