And according to "Zojo-ji Tokugawa Shogunbo to sono Ihin Itai" (The Tokugawa shogun family's graveyard at Zojo-ji Temple and the mementos and remains), which was mainly compiled by Suzuki, Ienobu's blood type was ABO, the same as his great-grandfather Hidetada, who served as the second shogun, and his father Tsunashige.
また、鈴木が中心となって編纂した『増上寺徳川将軍墓とその遺品・遺体』によれば、家宣のABO式血液型は曽祖父の第2代将軍・秀忠、及び父・綱重と同じくABO式血液型であった。