I need help finding a song?

My cousin is getting married I wanted to have a song played for her from me. We grew up together very close. We spent every weekend together and as we got older we became best friends. We we pretty much joined at the hip most of the time. We were there for each other for everything. Good or bad. I even tought her how to drive. I just need a song that relates to that and how much I love her and am proud that she's not only my cousin but my best friend. Could someone have any suggestions for me?