Eldest son, Kazutane CHIBA died in a battle before official family succession, so Ujitane took over as head of the family and succeeded the position of shugoshiki (military governor) in three provinces, Kazusa Province, Shimousa Province and Iga Province.
長兄・千葉一胤は正式な家督相続前に戦死していたため、氏胤が後を継ぐこととなり、上総国・下総国・伊賀国3カ国の守護職を継承した。