Vader Jan Sijbring
Moeder Hinderkien Vonk
She is married to Joannes van der Poel.
They got married on October 28, 1914 at Amsterdam , she was 37 years old.Source 3
Dochter Hendrika Reina Marianne Bennis, geb 5-3-1900 Amsterdam uit eerste huwelijk op 11-10-1899 met Cornelis Bennis, gescheiden 11-12-1913
https://archief.amsterdam/indexen/deeds/985333ea-9dcf-56a3-e053-b784100ade19