He was Tanemura's illegitimate child (a child to his second wife), but after Tanemura's death, he claimed that he became a legitimate child under Tanemura's will and confronted with his older paternal half-brother Taneuji.
胤村の庶子（後妻の子）であったが、胤村の死後、胤村の遺言で自分が嫡子になったと主張し、異母兄の胤氏と対立した。