My sister's words hurt my brother-in-law. How can I apologize?

As a middleman, you caused your sister to apologize.

It's up to you. My sister is too young to understand. I hope you don't share her common sense.

Then my sister will apologize and admit her mistake.

Two people are sincere and should be forgiven.

But in the future, we must pay attention to the discretion, otherwise it is easy to offend people.