家规用英语可以说成"house rules"。来源是由家庭共同制定的一些规定，以维护家庭的和谐。

例句：

We have to follow the house rules in this family. (在这个家里，我们必须遵守家规。)

What are the house rules? (家规都有哪些？)

The house rules say that we need to clean up after ourselves. (家规规定我们必须自己清理桌面。)