I'm writing a novella from a child's point of view. Is it all right to include grammatical errors in the narration ("me and my sister" instead of "my sister and I")? How can I make sure that the reader won't mistakenly believe that it is a genuine error?
Thanks.
Everyone has answered your question, so I am going to answer the question that wasn't asked. "Me and my sister" is not more or less grammatically correct than "my sister and I".
This is how I and Me work.
Say the sentence without the other person. So if the sentence was "Can you help _ and my sister with the dishes?" You say it without Sister, so you say, "Can you help me with the dishes?" (it isn't, "Can you help I with the dishes?"). Then you put "sister" back into the sentence, "Can you help ME and my sister with the dishes?"
THAT is grammatically correct.
What will make your sentence grammatically incorrect depends on the subject of your sentence. IF your sentence is "My sister and _ went to the store", then you would say it without "sister", "I went to the store" not "ME went to the store". Now put "sister" back in. "My sister and I went to the store"
THAT is ALSO grammatically correct.
I'm sorry to get on your case about this, but the ME vs I issue is a big deal to me, and people, even very intelligent writers, seem to not understand that one isn't better than the other, more grammatically correct than the other. They are BOTH correct, and BOTH wrong depending on the sentence.