Sidney was born on 20 November 1916 in Brighton, Sussex to Jonah Waldman and Lena née Klein and had a sister Kate and a brother Edward. In 1939, Sidney’s father Jonah was billeted at Volta House, Hampstead which was a sub station of the AFS. He worked as a clerk and was a member of the Auxiliary Fire Service. Sidney was living with his mother in Hampstead and was working as a clerk.

Sidney married Cecilia Goodman in 1941 in Lambeth. Their daughter Annette was born three months after his death.

Sidney was the wireless operator/air gunner on Halifax W1036 which departed RAF Linton-on-Ouse on a night operation to Flensburg. The aircraft was hit by flak and crashed at Sehestedt, southeast of the Wittensee lake. Four crew were killed and three became prisoners of war.

Pilot, Sgt J.K. Gregory, age 20, killed
F/E Sgt J.H. Hunt, Inj, POW
Nav, Sgt R.W. Johnson, age 20, killed
B/A, Sgt S.S. Waldman, age 26, killed
W/Op, F/S T.E. Turpin RCAF, age 22, killed
Mid Upper Gunner, Sgt K. Markillie POW
Rear Gunner, Sgt G.E. Morrison POW