You’re a big part of this family and an even bigger part of my heart!
Wishing you the best on your birthday, sweet brother-in-law!
Brother-in-law, I am wishing you all the happiness possible on your birthday this year! Have a great birthday!
To my dear brother-in-law and my true friend, I wish nothing but the best on your special day! May your day be...
I didn’t just gain a brother-in-law in you, I gained a true brother. Happy birthday to you, bro.
Happy birthday, brother-in-law! On your special day, I hope I can make you as happy as you make everyone else!