She was your first friend...and she's been your best friend ever since. So on her birthday, let your "amazing sister" know that your wish for her is a year that's full of all the wonderful things she deserves. This charming birthday card, featuring two sisters locking arms as they skip along a path, is the perfect way to remind her how much you cherish every minute you spend together, even if the demands of life keep you from seeing each other as much as you'd like.