Say no. It's called sibling rivalry, not abuse. If you has a tantrum or gets in your way, just say "I know what you did and I'll tell mum if you don't shift." Or something like that. If all else fails, there is something called stairs, use them to your advantage.
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L0lz reeper 4 m0dz0rz.
Seeing as some people didn't get it the first time round. *Coughmario.cough*