Another year has passed since you came into our lives, dear brother-in-law. You were a kid then, but you have grown into an amazing man and a wonderful husband to my sister.
I barely knew you then, but now, I must say, you are one of the most important people in my life. You are like a brother to me.
You are more than just my brother-in-law, I consider you a blood brother. Whatever you may need, just say the word. Have a fantastic birthday, dear brother!
You should consider yourself very honored and particularly lucky that you are one of the few people whose birthday I can remember by heart! You must be somewhat important to me, I guess!