(((((Shadow))))
When parents yell a lot, children stop listening. Yelling is not effective because it is out of control. Children need the parents to keep control so everybody stays safe.

Some people even learn to speak very quietly, reward children for listening and responding and have negative consequences for not listening.
I do not know how to suggest you get the spouse to stop yelling, but maybe you could help him see how it works against him. It shows the kids you do not listen to dad until he gets ".......THIS......." LOUD!!!!
You are correct to question yelling at the kids. It is not good discipline.
Leslie and Her Pixies