On the other hand, as Yoshiaki, who was the eldest son of Yoshitada, died earlier than his father, and the family estate of Nitta clan was passed down to his younger paternal brother Yoshimune NITTA, another theory states that the mother of Yoshimune was the legal wife of Yoshitada and the mother of Yoshiaki was a concubine.
一方で、義貞の長男である義顕は父に先立って死に、新田氏の家督は異母弟の新田義宗が継いだため、義宗の母が義貞の正室で義顕の母は側室であるとする説もある。