Something Feng Tianyi found foolish in his opinion. Tang Lixue should have abandoned the Tang family if he had known that they would betray him and his children in the future. Damn that filial piety. If Feng Tianyi was in Tang Lixue's shoes, he would rather forsake his whole family if that meant he would be able to protect Tang Moyu and their children's lives.
It was Tang Lixue's weakness and indecisive nature that pushed Yan Qiuyu to make such a decision to let him go, taking their twins away from him. Tang Lixue was fine with being poor and not being a young master of a wealthy family, but he couldn't just watch his aging parents lose everything they had.