Talk to them. Like, actually talking, AKA no shouting, complaining, fighting, or asking favors. Communication is key. (Ugh, I sound like a cheesy parent from a movie. It's true, though.) Just having random talks about random stuff (especially if it's more about them than you) makes them appreciate you more (bonding!), usually making them slightly nicer to you.
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How To Survive Your Younger Sibling
Random17 tips to surviving life with a little dem- I mean sibling that will probably save you from strict parents and (sometimes unfair) punishments
