《宋史·列传·卷一百六十》
有个婆婆诉讼她的两个儿媳妇不赡养她，刘宰召来两个儿媳妇，把她们和婆婆安排在一个房间里，有的时候给儿媳妇饭吃但不给婆婆，慢慢地观察她们，一个儿媳妇常把自己的饭菜给婆婆吃，婆婆还呵斥她，而另一个儿媳妇恰恰相反。就这样持续一段时间，就得到了事情的真相。
起知潭州，乞闲予祠者再。嘉定元年，召为刑部侍郎。五月不雨，异上封事言： 近日号令或从中出，而执政不得与闻其事，台谏不得尽行其言。
A grandmother was suing her two daughters-in-law for not providing for her. Liu Zai called the two daughters-in-law and put them in a room with their grandmother. Sometimes he would give the daughters-in-law food but not their grandmother, and slowly observed them. One daughter-in-law often gave her own food to the grandmother, and the grandmother would reprimand her, while the other daughter-in-law was the exact opposite. After continuing like this for a while, the truth about the situation was known.