Roosje Blok-van der Kloot's parents are incorrect as listed. They are actually Abraham van der Kloot & Eva de Koning.
Source citation
Municipal archive The Hague in Den Haag (Netherlands), Civil registration marriages
Ambtenaar van de burgerlijke stand van de gemeente 's-Gravenhage, 's-Gravenhage, archive 335-01, inventory number 780, 17-02-1904, Huwelijksakten Den Haag, record number 203
Also, she cannot possibly have the siblings listed, as Abraham van der Kloot is listed as being born 2 months after Roosje, and Jakob van der Kloot was born 2 months after his mother's death. I haven't checked on the other siblings; perhaps they are the children of the parents listed on Roosje's memorial page, but Roosje is definitely not.