In the section of August 7, 1179 in "Gyokuyo," there is a description that when Kanazane sent a messenger to visit him, it was reported that he had given all documents of the family to his legitimate son Nobumune (because he did not have much time).
『玉葉』治承3年6月25日条には兼実が信季に見舞いの使者を派遣したところ、（余命短いとして）嫡男信宗に家伝の文書を全て譲ったという報告がされたことが記されている。