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.

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.

From a big brother meeting his new baby brother ... and chose April 10 as the day of observance in honor of her sister, Lisette's birthday. If you're an only child, fret not: Only Child Day ...