DS2(13) is a real stirrer. Loves to wind his siblings up, usually DS3(11), who just takes the bait and goes for it, descending into an all out brawl more often than not.
Banishing them to their rooms has always worked well. However, I reckon it won't be long until DS2 towers over me. Removing privileges, which we always do, isn't immediate enough as they always need to be separated as it just continues otherwise.
So, those of you well into the teen years - can you still send them to their rooms? Or will you simply be laughed at?