Ichirō Hatoyama
Hatoyama was part of the prominent Hatoyama family. His father Kazuo Hatoyama was speaker of the House of Representatives of Japan during the Meiji era, and his brother Ichirō Hatoyama was an influential politician and minister in the 1930s and 40s. Through him, Hideo Hatoyama was able to exert great influence on Japanese jurisprudence.