In the official history, is Xue Gang the son of Xue Dingshan? Who's his mother? Mother Fan Lihua should be fictional.

There is no such person in history, it is a folk deduction, and the prototype is Xue Song, the grandson of Xue.

The Story of Xue Gang is a part of Xue's folk opera story series. He is Xue's grandson, his son. It can be found in Ju Shilian's Complete Biography of Anti-Tang Romance in Qing Dynasty, as well as storytelling and drama.

Fan Lihua, a fictional female general of Xiliangguo (West Turkic) in China's literary works in the early Tang Dynasty, was married by the father of Xiliangguo (West Turkic) and the son of Xue after Fan Lihua surrendered to the Tang Dynasty. After the Xue family was beheaded, Fan Lihua led his son Xue Gang to fight against the Tang Dynasty and avenge the rape. In folklore, she is a young woman in the Tang Dynasty who dares to love and hate, with broad mind, high martial arts, great magical powers and comprehensive talents.