Kulik has one sibling, sister Svetlana, who also lives in California. His parents live in Russia.
Kulik married Ekaterina Gordeeva in San Francisco on 10 June 2002.[6] They have one daughter, Elizaveta Ilinichna Kulik (born 15 June 2001). Gordeeva has another daughter, Daria Sergeevna Grinkova (born 11 September 1992), from her first marriage to her late husband and skating partner, Sergei Grinkov. The family lived in California for several years before moving to Avon, Connecticut, in 2003. They returned to the Los Angeles area in the summer of 2007 and resided in Newport Beach. According to People magazine's 2018 Special Edition "The Best of Olympic Figure Skating", Gordeeva and Kulik divorced in 2016.[7][8]