His younger sister Tosa OTAKA married Yuen NAKAI, who was the director of Suisaikan school and whose father was Riken NAKAI, director of Kaitokudo school ("Kinsei Gakugei Ronko - Hagura Keisho Ronbunshu" [Discussion on the Studies in the Early Modern Times - Collected Articles of Keisho HAGURA] edited by Jun SUZUKI and published by Meiji Shoin), but she died at such a young age of 25.
妹に大高土沙がおり、懐徳堂学主中井履軒の息子で、水哉館館主であった中井柚園に嫁したが（『近世学芸論考-羽倉敬尚論文集-』鈴木淳編、明治書院）、二十五歳の若さで没している。