Alexander Ketellapper was a son of Marcus Ketellapper and Rachel Bonewit. He married 2 March 1921 in Amsterdam to Schoontje Frinkel, a daughter of Simon Frinkel and Jetje Goldsmit.
The couple had three children.
Alexander was born in a family with ten children. Two of his sisters have passed away before the war. His other siblings, Isaac, Abraham, Hijman, Marianne, Leentje, Nathan and Vrouwtje hav…