You Are My Sister

You are a sister, and you have to give in to your brother; you are a sister, and you have to be sensible; you are a sister, and you have to give in to your brother when it comes to delicious food; you are a sister, and he is your biological brother. So, did my sister do something wrong? It's just that he was born a few years or a few months earlier. Doesn't that count as wrong? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.