Question: Who is Empress Guo (Cao Rui'S Wife)'s mother-in-law?
Sentence (from "Empress Guo (Cao Rui's wife)"): (Sima Yi and his sons Sima Shi and Sima Zhao) during the reigns of her adopted son Cao Fang and his cousin Cao Mao, but was unable to stem the tide.
Relevant evidence: No