It is absolutely out of line. Your little brother is sure lucky to have you as his big sister.

There is lore that says that http://en.wikipedia.org/wiki/Johannes_Kepler, one of the greatest mathematicians, survived because of the love of his older sister. He was sickly and miserable when little and his parents did not love him, but the sister did. Do not know how much truth there is to the story, though.

Switching topics:

Now I see why your not having a driver's license matters so much!