He became the family's first onderduiker–what my Dutch-born mother called "under-diver", usually translated "person in hiding". He hid in the house to avoid being taken to Germany to work in a factory or for the Wehrmacht.
Bob Boissevain Sr. died in a Nazi concentration on the day of liberation in 1945. His wife Sonia meanwhile was called "General Eisenhower" by her four guests.
(For followers of Inez Milholland Boissevain: Bob Boissevain Sr. was her nephew by marriage to Eugen Boissevain. Charles E. H. and Eugen were my grandmother's brothers.–JTM)
Here is a translation of the Dutch text in the death notice above: