I am annoyed at my sister-in-law's violent temper. Every day, her voice is so loud that I am awakened. Hey! I have a knot in my heart when I scold my children!

Since you are a family with your sister-in-law, you know his violent temper. Maybe this kind of temper is straightforward and outgoing. In this case, you can gently remind him of her performance, just like joking. Since we are a family, I don't think your sister-in-law will care. Try it, and see if she will pay attention in the future.