 His wife Princess Pingyi had one son, Yuwen Jue, but his oldest son, Yuwen Yu, was born of his concubine Lady Yao, and was married to the daughter of one of his chief generals, Dugu Xin.On the advice of Li Yuan (李遠), who argued that the son of a wife always had precedence over the son of a concubine, Yuwen Tai made Yuwen Jue his heir apparent.in fall 556, while Yuwen Tai was on a tour of the norther provinces, he became ill at Qiantun Mountain (牽屯山, in modern Guyuan, Ningxia).