Married to:  Name Withheld, son of Kornelis "Kees" Koster and Filippina Hendrika "Pien" van der Horst. PRIVACY FILTERChildren: 1. Name Withheld PRIVACY FILTER2.  Name Withheld PRIVACY FILTER3. Name Withheld PRIVACY FILTER4. Name Withheld PRIVACY FILTER | |||