Good Neighbors, Good Fences, Etc

So, I have new neighbors. They live in the house that is back, to the left. They've been there about six weeks. Three little kids and an older lady. And sometimes a guy. And sometimes some other woman. And a lot of yelling and screaming.

Now, I don't find the sound of little kids carrying on, being little kids, disagreeable. I do find the sound of children screaming in mortal terror to be a call to action.

Yesterday I got home and laid down on my bed to relax for a moment. Jackie came in and laid down. We listened to the neighbor lady screaming in anger and children screaming in reply. Jackie said this had been going on, on and off for parts of the afternoon. Most of their words were unintelligible, but the tone was not mistakeable. I dithered for several minutes. The yelling continued. I got up, exited my backdoor, walked across the neighbor's lawn, and banged on their door. A dishevelled and remarkably subdued and meek woman answered the door.

K-I've been hearing screaming for the last half hour coming from your house. Is everyone OK, because it doesn't sound like it.
L-Well, my son disobeys and he... he yells sometimes.
K-I'm hearing you screaming. You need to stop screaming. I don't want to hear it. Whatever you're doing, you need to stop screaming. OK? I don't want to have this conversation again, OK?

I formally accepted her grunt as acknowledgement of our verbal contract: She will cease screaming, I will cease visiting. We'll see.