While staying at my parents house

My brother wakes me up pretty much ever night or morning at one point or another, often more than once, playing his guitar too loud. I'm fucking so over it. He has no courtesy or respect for anyone around him. So how can I break an amp without it being obvious?? Seriously this has gone on for three months now. We need relief. It's not hurting anyone, but he is, when he wakes my son up and my son can't finish his naps. Etc.