渕正信
His niece, Yukari Ishikura (石倉 由加利 "Ishikura Yukari"), was also a professional wrestler. She wrestled for Frontier Martial-Arts Wrestling. In 2007 and 2008 Pro Wrestling NOAH held the "Mauritus Cup" tournament in honor of Sonoda. In November 2016, Atsushi Onita and Masanobu Fuchi dedicated their All Asia Tag Team Championship win to Sonoda, whom they trained together in the AJPW Dojo in the 1970s.