He is the father of Kane and Shane Kosugi. After taking a hiatus from film, he started a taiko group in California. In Japan, he also ran an internationally oriented group of martial arts acting schools known as the Sho Kosugi Institute. He resides in Los Angeles. Films in which Kosugi's sons perform alongside their father include Revenge of the Ninja, Pray for Death, Black Eagle, and Journey of Honor (aka Kabuto, aka Shogun Warrior).