Siblings
Siblings, as I see it, are both the biggest curse and largest blessing that one person can every hope to have. Seriously. I mean, think about it. For a first born: there you are minding your own business, soaking in all the love, affection, and attention your parents can possibly dole out and then, BAM! Suddenly, there is a small, loud, often stinky creature that sucks all the energy and attention out of good ole mom and dad.