I cannot, with this thought in my mind, ever again be happy under your roof, and I feel that I must leave you forever.

我心里存着这种念头，就再也不能愉快地住在你的屋檐下了。而且我觉得我必须永远离开你。

In charging them to live back under your roof you are also forcing them to become aware of expenses which many of them may know little about.

通过向子女收房租，你还能迫使他们意识到各种开支，他们中很多人对此可能都知之甚少。