My mum, Bobby Stolk, played with Benjamin( she called him Benno) when she was about 9 years old. She had to turn off / on the light on Sabbath Eve. She lived opposite number 8 on Singelstraat number 11. One day the family was gone. The appentice of the family Knorringa brought a clock , a pendula, to keep this for them if they would return which never happened.