Everyone knows that Left Prime Minister Su Tian has one main wife, three Concubines, Five daughters, and two sons borne from the main wife. One of the sons was older than Su Yan and the other was younger than Su Yan.
People also know that the abandoned Concubine has a daughter named– Su Yunxi who wasn't regarded because her mother was reported to not have observed filial piety to her husband.
However, when the Concubine was about to be punished by the rules governing Hua Xia, Old Madam Su rushed back from the temple and pleaded for leniency from the Emperor. She said that her daughter-in-law was good to her, so the Emperor passed the decree, excusing the unfilial Concubine from capital punishment.
But that didn't mean that the Emperor prevented Left Prime Minister Su Tian from doing what he wanted with his wife.
