The meaning of 'family cooperation' had been unclear, because only simple acknowledgments were expressed in the foreword to "Genji monogatari taisei," so it was not known who cooperated with him and what help was given concretely.
この「家族の協力」という点については『源氏物語大成』の序文等に謝辞が簡単に記されているに過ぎなかったため誰がどのような協力をしたのかその具体的な内容は不明であった。