In the old series of genealogy including "Jindaihon Chiba Keizu" (the original genealogical charts of the Chiba clan), which is considered to be the early edition of the Chiba clan genealogy, describe that Tokitane was the eldest son of Tanetsuna, while "Hannyain Keizu" that falls in the same series edited by Gongen IZUSAN places Yasutane CHIBA as Tokitane's younger brother, who acted as the guardian of Yoritane.
千葉氏の系譜の初期のものと考えられる『神代本千葉系図』などの古い系図では、時胤を胤綱の長男とし、同じ系統の伊豆山権現『般若院系図』では、その弟に頼胤の後見を務めた（次郎）を配置している。