1. I heard she comes from a middle-class family.2. How does growing up in a rich family affect your values?3. We are three siblings, two brothers and I. I was born in a wealthy family which is able to provide me with everything my heart desires.
a middle-class family在很多社會裡，middle class 介於 working class 跟 upper class 之間，也就是社會跟經濟的地位還不錯，可以用來表示「小康家庭」。但如果你想表達富裕的家庭，可用 a rich family 或 a wealthy family。