His siblings were the renowned Finnish philosopher Lilli Alanen and Johan Gullichsen, a professor of engineering. Kristian Gullichsen had three sons and two daughters, one of the sons was the artist Alvar Gullichsen (born 1961).
Kristian Gullichsen had children with professional backgrounds; his siblings included Lilli Alanen, a well-known philosopher, and Johan Gullichsen, an engineer. One of his sons was the artist Alvar Gullichsen (born 1961).