Question: Who is the father of Empress Wang's husband?

Knowledge 1: Empress Wang (Yang Pu)
Empress Wang (王皇后, personal name unknown), known as Empress Rang (讓皇后, "empress of the emperor who yielded") during Southern Tang, was the wife and empress of Yang Pu (Emperor Rui), the final ruler of the Chinese Five Dynasties and Ten Kingdoms period state Wu. As he was the only ruler who claimed the title of emperor, she was the only person to carry the title of empress during Wu. [SEP] Knowledge 2: Empress Dowager Wang (Rui)
Empress Dowager Wang (王太后, personal name unknown) (died 928) was a concubine of the late-Tang Dynasty warlord Yang Xingmi and the mother of his son Yang Pu, the final ruler and the only emperor of the Wu state founded upon the territory that Yang Xingmi took. During Yang Pu's reign as emperor, she was honored as empress dowager.
Knowledge 1: Empress Wang (Yang Pu)
Empress Wang (王皇后, personal name unknown), known as Empress Rang (讓皇后, "empress of the emperor who yielded") during Southern Tang, was the wife and empress of Yang Pu (Emperor Rui), the final ruler of the Chinese Five Dynasties and Ten Kingdoms period state Wu. As he was the only ruler who claimed the title of emperor, she was the only person to carry the title of empress during Wu. [SEP] Knowledge 2: Sima Yuanxian
Sima Yuanxian was the son of Sima Daozi the Prince of Kuaiji, the younger brother of Emperor Xiaowu and son of Emperor Jianwen, and he was born during the reign of his uncle Emperor Xiaowu. When Emperor Xiaowu was murdered by his concubine Honoured Lady Zhang in 396, he was succeeded by Emperor An, and Sima Daozi, as the emperor's uncle, became regent. Sima Daozi's trusted associates Wang Guobao (王國寶) and Wang Xu (王緒), because of their corrupt ways, quickly drew the ires of provincial officials Wang Gong (王恭) and Yin Zhongkan (殷仲堪), and in 397, Wang Gong and Yin started a rebellion, demanding that Wang Guobao and Wang Xu be killed. Sima Daozi, apprehensive of Wang Gong and Yin's power, executed Wang Guobao and Wang Xu, and Wang Gong and Yin withdrew. It was at this juncture that Sima Yuanxian, Sima Daozi's heir apparent, who was 15 but considered intelligent and capable, warned Sima Daozi that Wang Gong and Yin would one day again rebel. Sima Daozi, trusting his son, entrusted Sima Yuanxian with his personal guards.
Knowledge 1: Wang Shen'ai
Wang Shen'ai was the daughter of the official Wang Xianzhi, the son of the famed official and calligrapher Wang Xizhi. Her mother Princess Xin'an was the daughter of Emperor Jianwen, making her and her husband cousins. In 396, while he was still crown prince under his father Emperor Xiaowu, they married, and she became crown empress. She was 12, and he was 14. As he was described to be so developmentally disabled that he could not speak or dress himself, or express whether he was full or hungry, it was unlikely that their marriage was consummated; in any case, they had no children. Later that year, after Emperor Xiaowu was killed by his concubine Honoured Lady Zhang after humiliating her, Emperor An became emperor. In 397, she was created empress. [SEP] Knowledge 2: Sima Yuanxian
Sima Yuanxian was the son of Sima Daozi the Prince of Kuaiji, the younger brother of Emperor Xiaowu and son of Emperor Jianwen, and he was born during the reign of his uncle Emperor Xiaowu. When Emperor Xiaowu was murdered by his concubine Honoured Lady Zhang in 396, he was succeeded by Emperor An, and Sima Daozi, as the emperor's uncle, became regent. Sima Daozi's trusted associates Wang Guobao (王國寶) and Wang Xu (王緒), because of their corrupt ways, quickly drew the ires of provincial officials Wang Gong (王恭) and Yin Zhongkan (殷仲堪), and in 397, Wang Gong and Yin started a rebellion, demanding that Wang Guobao and Wang Xu be killed. Sima Daozi, apprehensive of Wang Gong and Yin's power, executed Wang Guobao and Wang Xu, and Wang Gong and Yin withdrew. It was at this juncture that Sima Yuanxian, Sima Daozi's heir apparent, who was 15 but considered intelligent and capable, warned Sima Daozi that Wang Gong and Yin would one day again rebel. Sima Daozi, trusting his son, entrusted Sima Yuanxian with his personal guards.

Answer: Yang Xingmi