Hover over photo for color.

On the left hand side:
Bob, Willem (Wim) and Heleendert (Bert) (sons of Willem van der Veer and Henriette Louise Jansz). Bert is Mariette and Birthe's father, and grandfather to Birthe's children, Jan Gesink, Jr., and Josephine Gesink. Birthe passed in 2019. Way too young.
On right hand side:
Probably the 3 sons of Kors van der Veer and Helena Berendina Jansz.