You may roll your eyes at your sister twelve times a day. Shake your fist in her direction. Sigh in aggravation. But when it comes down to it, she lifts up your mood more than she drags it down. So brighten your sister's birthday. Let her know that even though you can't celebrate together in person, you're still with her where it matters - the heart. Wish your sister a cheerful day that can match her smile for her birthday.