Dear Missy,
I know I don't really say it, but I look up to you in so many ways. I know there were a solid couple of years where you just simply didn't like me, and you asked mom to give me back to the hospital when I was born, but I'm glad that at least somewhat changed. I realize more and more as I get older how lucky I am to have you as my older sister.
Thank you for always being there for me, whether it's just to say hi and annoy you, or if it's when I need someone to cry to. I know I can go to you for anything and you'll always be there to listen, and I appreciate it more than I could ever say. Thank you for always being the person I can count on to be on my side. I know you always want the best for me, and won't hesitate to tell me what you think that is.
Thank you for having a better taste in clothes than me, so I can always find something I like when I steal stuff from your room. Thank you for always being there to annoy mom with me (sorry mom, we love you).You're basically my built-in best friend, which, even if you don't want it, you're stuck with me for life. I mean, who else are you going to annoy by randomly walking in their room, to then say nothing, and just leave. I'm so lucky to have you as my older sister, and I'm equally as lucky to be able to be so close to you. Thank you for being my sister, and for also being my best friend.
Love,
your annoying little sister