Dai Jiaju is the son of Dai Chuanxin, the eldest brother of Dai, who is also my nephew. Dai Jitao lost his father in his early years, and Dai Chuanfu, his eldest brother, was a great boon to him. Brother urged to sell 30 mu of ancestral sandy land as the cost of studying in Japan. Later, Dai took care of his nephew Dai Jiaju. Later, Dai Jiaju became a professor in Tsinghua University.