There's a cute children's book by Mercer Mayer, "Me Too!" that I bought as a gift for the youngest niece. Giving it, because she will have a new sibling in about a month.

It's a picture which shows a grumpy, but willing older brother who looks after his baby sister. Baby sister follows him around and wants to emulate him. And he teaches her grumpingly meanwhile fuming away because he can't play independently. There is this friggin' baby sibling tagging him along. In the end, baby sibling innocently offers him a candy.
http://www.randomhouse.com/kids/catalog/display.pperl?isbn=9780307119414

It's very cute, but it nearly made me tearful.
Siblings can be friends for life.
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