And while you might not see your sister as often as you'd like, her birthday is the perfect opportunity to express just how ...

These funny, heartfelt, and sentimental birthday wishes go perfectly in a card (especially when paired with a gift for your sister), in an Instagram caption, or even in an early birthday morning text.

Stuck on what to say? Here’s what to write in a birthday card for a friend, coworker or that special someone in your life.