1. "Happy birthday to my cousin, my childhood partner in crime, and the guy who still owes me $5 from that bet we made in 2010. Here’s to another year of laughter, bad ideas, and finally paying up (maybe). Cheers!"
2. "To my cousin brother—thanks for being the sibling I never had, but with way less fighting over the remote. Hope your birthday’s as awesome as the time we snuck out to get ice cream and blamed it on the dog. Enjoy every second!"
3. "Another trip around the sun with my favorite cousin! From treehouse wars to adulting (sort of), you’ve always made life more fun. Happy birthday—let’s keep the good times rolling, even if we’re too old for treehouses now."
4. "Happy birthday to the cousin who’s more like a brother. Thanks for bailing me out of trouble, listening to my rants, and never letting me take myself too seriously. Today’s all about you—make it count!"
5. "Remember when we thought turning [age] was ancient? Now we’re here, and I’m just glad we’re still the same idiots, just with better beards (or worse, no judgment). Happy birthday, man—let’s celebrate like we’re 12 again."
6. "To my cousin brother: you’re the first person I call when I need a partner for a dumb adventure, and the last one to let me do something *really* stupid. Thanks for keeping me in line (mostly). Happy birthday!"
7. "Happy birthday to the guy who grew up right beside me—stealing my toys, borrowing my clothes, and somehow still being my favorite cousin. Here’s to another year of you getting away with it. Love you, man."
8. "Family gatherings aren’t the same without you—thanks for being the life of the party, the one who knows all the aunt jokes, and my go-to for sneaking extra pie. Happy birthday—may your day be as great as you are."
9. "From childhood pranks to adult milestones, you’ve been there through it all. So grateful for my cousin, my friend, my wingman. Happy birthday—here’s to the next chapter, whatever it brings."
10. "Happy birthday to my cousin brother! You’re proof that family can be your best friends. Thanks for the memories, the advice (even when I didn’t ask), and the endless supply of dad jokes. Have a blast today!"
11. "We’ve come a long way from fighting over video games to fighting over who has to host the next family dinner. Happy birthday—may your day be full of wins, big and small. And maybe let me win at something, just once?"
12. "To my cousin: you’re more than family—you’re the guy who gets my weird, supports my wild ideas, and still laughs at my terrible puns. Happy birthday—here’s to another year of being awesome, together."
13. "Happy birthday to the cousin who made growing up feel like an adventure. Whether we were exploring the woods or just annoying our parents, it was always better with you. Here’s to many more adventures!"
14. "Another year, another reason to celebrate the best cousin around. Thanks for being the kind of guy who shows up, no matter what—whether it’s a birthday or a breakdown. You’re the best, and today’s yours."
15. "Remember when we tried to build a rocket out of soda bottles? Spoiler: it didn’t work. But hanging out with you? Always works. Happy birthday—let’s plan something (slightly) less explosive this year."
16. "To my cousin brother: you’re the definition of ‘ride or die’—even when my ‘ride’ is a terrible idea. Thanks for sticking with me through it all. Happy birthday—enjoy your day, you deserve every bit of it."
17. "Happy birthday to the guy who’s equal parts annoying and amazing (but mostly amazing). From sharing a room at grandma’s to sharing life updates, I wouldn’t trade you for the world. Cheers to you!"
18. "Family’s great, but having a cousin who’s also your best friend? That’s a superpower. Thanks for being mine. Happy birthday—may your cake be sweet, your gifts be cool, and your day be perfect."
19. "We’ve got a lifetime of inside jokes, and I’m not done making more. Happy birthday to my cousin brother—here’s to the next set of memories, the next round of laughs, and the next time you owe me money."
20. "To my cousin, my partner in all things fun, and the one who knows all my secrets: happy birthday. Thanks for being you—crazy, loyal, and always down for a good time. Here’s to us, now and always."