御璽
Shigeto Tsuru married Masako Wada in June 1939. She was a daughter of prominent Dr. Koroku Wada (who later became President of the Tokyo Institute of Technology), who was himself brother of Marquis Kido, Lord Keeper of the Privy Seal of Japan. The Kido family were descendants of the "Three Architects of the Meiji Restoration." Together they had three daughters.