Meijer Spier had another son: Louis Spier (b. 1900) who lived at different address.
Addition of a visitor of the website
Meijer Spier owned a cloth shop in Dedemsvaart.
USC Shoah Foundation, USC-SF nr. 10449 (interview Roberta Boom-Spier)
In June 1940, an obituary was placed in the Nieuw Israëlietisch Weekblad for Meijer Spier.
Nieuw Israëlietisch Weekblad, 7 June 1940