When did the emperor know that Wei Zi's grandparents cheated him in Princess New Zhu Huan?

Xiao Jian, the 85th episode of Princess New Zhu Huan, took Sonny away, but was persuaded by Sonny to return to the team. Master Li returned to Beijing to report several injuries and presented prescriptions and poems found in the quadrangle. Under the persuasion of the imperial concubine, the emperor sent Fallon. Xiao Jian took everyone to He Jia, and Yongqi saw Xiao Jian who was practicing martial arts in close contact with Swallow. Jealousy leads to escalation of conflict. He was in a hurry, but he admitted that Swallow was his own sister and told them that their real name was Xiao, their father was hunted, and their mother was a double martyr. The emperor took Wei Zi's great-uncle and great-aunt to Cining Palace, and they admitted in front of everyone that they were instructed by Pu's father-in-law to make a fake.