[4] In the Soviet Union his full name in Russian was given as "Миколас Гецелевич Слуцкис".

[5] During World War II, in summer 1941 (when Lithuania was under Soviet occupation) he was evacuated from the Soviet Young Pioneer camp in Palanga and lived in a rural orphanage in Russia, in Malmyzhsky District of the Kirov Oblast.

[6][7] His parents and brother were killed in Holocaust, only he and his younger sister survived.

[1] For 20 years he was married to Regina née Važgauskaitė and they had daughter Snieguole.

[7] Among other works, Sluckis wrote some 20 books for children and youth, mostly in his early years.