- Children: Albert Thilo Ludwig Arndt (b. December 14th 1999 in Göttingen), Eugenia Friederike (b. July 19th 2001 in Göttingen) and Julius Eduard Emanuel (b. February 22sd 2006 in Göttingen), as well as Oscar Julius Heinrich Ferdinand Nick (b. September 29th 1996 in Berlin) by former girlfriend Désirée Nick.
- Brother of Prince Ernst August of Hannover and brother-in-law of Princess Caroline of Monaco.
- Brother of Princess Marie (b. 1952), Prince Ludwig (1955-1988), Princess Olga (b. 1958) and Princess Alexandra of Hannover (b. 1959).
- Son of Ernst August, Prince of Hannover (1914-1987) and his first wife Princess Ortrud of Hannover (1925-1980).
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