1. "Happy birthday! Remember when we used to steal cookies from Grandma’s jar? Now we’re adults... who still steal cookies. Cheers to never growing up (but maybe paying for them sometimes)!"
2. "To my favorite partner-in-crime: Happy birthday! Let’s celebrate by reenacting our childhood dance routines—this time with better music (and fewer awkward haircuts)."
3. "Another year older? Please. You’re just upgrading to ‘extra awesome’ version 2.0. Happy birthday, cousin!"
4. "Congrats on surviving another year of my bad jokes! As your birthday gift, I’ll try to come up with a new one... but no promises. Have a rad day!"
5. "Happy birthday! Remember when we thought eating an entire cake was a great idea? Let’s try that again—this time, blame it on ‘birthday traditions’."
6. "To the person who knows all my embarrassing childhood stories: Thanks for keeping them secret (mostly). Have the best birthday ever, cuz!"
7. "Birthday alert! Today, you get to boss me around—just like when we were kids, but now I’ll actually listen (maybe). Enjoy your day!"
8. "Happy birthday! May your cake be as sweet as our childhood memories... and may your candles be easier to blow out than that time we tried to light a campfire with a stick."
9. "Cousin, you’re the reason I believe in built-in best friends. Happy birthday! Let’s make this year as fun as our epic pillow forts."
10. "Another year wiser? Nope—just another year of us figuring out life together. Happy birthday! Let’s celebrate with pizza and zero adulting."
11. "Happy birthday! Remember when we thought we’d be famous by now? Well, we’re famous in our own weird family, so that counts. Cheers to you!"
12. "To the cousin who’s more like a sibling: You can’t escape my birthday shenanigans—mwahaha! Have a day as awesome as you are."
13. "Birthday rule #1: No chores allowed. Rule #2: All snacks must be shared (like when we were kids). Rule #3: You have to pretend my gift is amazing. Happy birthday!"
14. "Happy birthday! May your day be filled with cake, laughter, and zero awkward family photos (unlike that one from 2008... you know the one)."
15. "Cousin, you’re the highlight of every family reunion—and now you’re the highlight of today! Have a birthday that’s cooler than our old flip phones."
16. "Happy birthday! Let’s toast to all the times we got in trouble together... and the times we blamed it on the dog. Here’s to more chaos (and cake)!"
17. "You’re not just a cousin—you’re my personal hype person, prank partner, and memory-maker. Happy birthday! Let’s make this year unforgettable."
18. "Birthday challenge: Try to have more fun than we did when we dressed up as pirates and raided the fridge. Good luck—you can’t beat that level of awesome!"
19. "Happy birthday! Remember when we thought 30 was ancient? Well, we’re [insert age] now... and we’re killing it. Cheers to us!"
20. "To my favorite cousin: You make life more exciting, more hilarious, and more meaningful. Have a birthday that’s just as amazing as you are—love ya!"