When Nobunaga succeeded the head of the family after Nobuhide's death, Nobutomo opposed Nobunaga by supporting the succession to the position of family head by Nobuyuki (Nobukatsu) ODA, a younger brother of Nobunaga, and planned to murder Nobunaga.
信秀の死後、信長が後を継ぐと、信友は信長の弟・織田信行（信勝）の家督相続を支持し、信長と敵対し、信長謀殺計画を企てた。