Is Wei Zi the son of the Great Sage of Xuanzong?

The origin of Wei Zibei's Emperor Tai Shang said that Sheng Da's Zhenwu was a vivid mantra was quoted from Beidou Bensheng Jing, saying, "In the early years of the Long Han Dynasty, Mrs. Ziguang visited Wen Bathroom last spring and then undressed and bathed. Suddenly, she felt that the lotus was nine bracts, and when she developed well, she became nine. His wife hugged and bowed in the palace, and she volunteered to be a sage and help with her work. Emperor, eldest son, Zihui, Shanggong Jigang, Yuanxing. The second son, Wei Zi, assisted the Arctic Zhongmu Tang Ming to cover the soil. "