The family Schaap committed suicide in the night of 13 to 14 May, 1940 in their house at the Noordeinde 86 in The Haque. The police found 4 glasses and 4 papers with a powder.
Joel Schaap owned a jewelry store at the Noordeinde, 86. The family lived above the shop.
Schaap told his people several times that if the Queen leaves the country in connection with the danger of war he would commit suicide.
Source: Lucas Ligtenberg, “Mij krijgen ze niet levend” Uitgeverij Balans 2017, ISBN 978 94 600 3845 7