Yasuhisa's father was Yasunaga TAMURA who worked at the prewar Ministry of Home Affairs, and his uncle (parent's older brother) was Tamotsu MURATA who was a senator of the House of Lords and known for his impeachment address against Yamamoto's Cabinet which was allegedly involved in the Siemens scandal.
父は内務省(日本)勤務の田村保永、伯父は貴族院(日本)議員でシーメンス事件での弾劾演説で知られる村田保。