One other thought - Don't know how she'd feel but you could put duct tape over the cracks between the rooms to keep him from peaking.
The rest of the advice here is great. Bring it up to Mom first as the kids are first priority. Depending on her response there's always an annonymous tip to child protective services if you feel there's a real problem.
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"Always learn the rules so that you can break them properly." Dalai Lama
My Karma just ran over your Dogma.
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