DEESCALATE the situation. He’s your neighbor. You can use a battery to electrify your chicken coop. You can use your phone camera to film the morning “fire fight” and visit your local police and request that they visit him and get your safety concerns on the record. Those are thoughtful...
You only need to let the neighbor know that there is a baby...some balloons —announcing banner — get creative—be friendly (wave). He might just be a lonely old man. But wire up the chicken coop.