His father, Nicolas Kitsikis (1887–1978), rector of the Polytechnic School in Athens, the most famous civil engineer of Greece, was a senator and an MP. His uncle, Konstantinos Kitsikis (1893–1969), a celebrated architect, Nicolas' younger brother, was also a professor at the Athens Polytechnic School. His grandfather, a chief justice, Dimitri Kitsikis senior (1850–1898), had settled in Athens, in 1865, from Lesbos, his native island and was married to Cassandra (Κασσάνδρα), the sister of a member of the Greek Parliament, Dimitri Hatsopoulos (Δημήτρης Χατσόπουλος), 1844–1913, born in Karpenisi.[7]