...first, I'd get a muzzle for the damn howler monkey neighbours' dog. Not because of the barking, but because of the dog being one of the root causes for the everlasting bloody aggravation: see, he's got some Doberman in the mix, and his owners are total assholes, so he's decent-sized, frisky and badly educated. That makes him pinch the damn kids when they yell and scream too much, eliciting more screaming and howling, which generates more pinching and screaming and tantrums...Oh Joy.
Next, I'd cut all the howler monkeys' vocal cords, and thus earn the everlasting gratitude from the other neighbours around - who are all fairly quiet denizens.
And finally, I'd shoot all the monkey neighbours for good measure - 'it's the only way to be sure'.
No, I'm not angry, not at all. Why do you think so?
From the bottom of my heart I wish the plague and a quick, quiet death on these neighbours.