Question: Who is the child of Chiang Hsiao-wen's father?

Knowledge 1: Chiang Hsiao-wen
Chiang Hsiao-wen (; also known as Alan Chiang; 14 December 1935 – 14 April 1989) was the eldest son of Chiang Ching-kuo, the President of the Republic of China in Taiwan from 1978 to 1988. His mother is Faina Ipatyevna Vakhreva, also known as Chiang Fang-liang. He had one younger sister, Hsiao-chang, and two younger brothers, Hsiao-wu and Hsiao-yung. He had two half-brothers, Winston Chang and John Chiang, with whom he shared the same father. [SEP] Knowledge 2: Chiang Ching-kuo
The son of President Chiang Kai-shek and his first wife, Mao Fumei, Chiang Ching-kuo was born in Fenghua, Zhejiang, with the courtesy name of Jiànfēng (). He had an adopted brother, Chiang Wei-kuo. "Ching" literally means "longitude" while "kuo" means "nation"; in his brother's name, "wei" literally means "parallel (of latitude)". The names are inspired by the references in Chinese classics such as the "Guoyu", in which "to draw the longitudes and latitudes of the world" is used as a metaphor for a person with great abilities, especially in managing a country.
Knowledge 1: Chiang Hsiao-wu
Chiang Hsiao-wu (; also known as Alex Chiang; April 25, 1945 - July 1, 1991) was the second son of Chiang Ching-kuo, the President of the Republic of China in Taiwan from 1978 to 1988. His mother is Faina Ipatyevna Vakhreva, also known as Chiang Fang-liang. He had one older brother, Hsiao-wen, one older sister, Hsiao-chang, and one younger brother, Hsiao-yung. He also had two half-brothers, Winston Chang and John Chiang, with whom he shared the same father. [SEP] Knowledge 2: Chiang Ching-kuo
The son of President Chiang Kai-shek and his first wife, Mao Fumei, Chiang Ching-kuo was born in Fenghua, Zhejiang, with the courtesy name of Jiànfēng (). He had an adopted brother, Chiang Wei-kuo. "Ching" literally means "longitude" while "kuo" means "nation"; in his brother's name, "wei" literally means "parallel (of latitude)". The names are inspired by the references in Chinese classics such as the "Guoyu", in which "to draw the longitudes and latitudes of the world" is used as a metaphor for a person with great abilities, especially in managing a country.
Knowledge 1: Chiang Hsiao-wen
Chiang Hsiao-wen (; also known as Alan Chiang; 14 December 1935 – 14 April 1989) was the eldest son of Chiang Ching-kuo, the President of the Republic of China in Taiwan from 1978 to 1988. His mother is Faina Ipatyevna Vakhreva, also known as Chiang Fang-liang. He had one younger sister, Hsiao-chang, and two younger brothers, Hsiao-wu and Hsiao-yung. He had two half-brothers, Winston Chang and John Chiang, with whom he shared the same father. [SEP] Knowledge 2: Chiang Hsiao-wu
Chiang Hsiao-wu (; also known as Alex Chiang; April 25, 1945 - July 1, 1991) was the second son of Chiang Ching-kuo, the President of the Republic of China in Taiwan from 1978 to 1988. His mother is Faina Ipatyevna Vakhreva, also known as Chiang Fang-liang. He had one older brother, Hsiao-wen, one older sister, Hsiao-chang, and one younger brother, Hsiao-yung. He also had two half-brothers, Winston Chang and John Chiang, with whom he shared the same father.

Answer: Chiang Hsiao-wu