Read. Or at least have a book in your hand, the sibling will think that you are busy and distracted, making them (maybe, varies from sibling to sibling) leave you alone. If they see you with an item that could potentially be used as a weapon, they might leave you alone as well.
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How To Survive Your Younger Sibling
Acak17 tips to surviving life with a little dem- I mean sibling that will probably save you from strict parents and (sometimes unfair) punishments