Emperor Go-Mizunoo
The youngest, Oeyo (also called Ogō), married Tokugawa Hidetada, Ieyasu's heir and the second Tokugawa Shōgun. They had many children, including the third Shōgun Iemitsu, and Kazuko, consort to Emperor Go-Mizunoo. Kazuko's daughter Okiko became Empress Meishō, thus posthumously making Oichi both a grandmother to a Shōgun and a great-grandmother to an Empress.