fangnan

Before he left he begged the emperor for a favor--to erect a chastity archway in honor of his widowed mother.
在他还乡之前他请求皇上恩典，给他的寡母树一个贞节牌坊
It rains when Heaven deems fit, mother remarries when she wants to.
天要下雨娘要嫁人

It is a well-known story in China.