Accordingly, Kagekatsu UESUGI, who was another son of Masakage, rivaled Kagetora in the 'Otate no ran' rebellion and was to be the first Lord of Yonezawa Domain, was Domanmaru's maternal uncle, and Sentoin, who was the mother of Seienin and Kagekatsu and the wife of Masakage, was his grandmother.
よって、同じく政景の息子で御館の乱で景虎と対立した後の米沢藩初代藩主・上杉景勝は叔父であり、清円院、景勝の母で政景の妻・仙桃院は祖母に当たる。