There are many uncertainties in life, but one thing you can always be sure of is that I’ll always be younger than you! Happy birthday from your little sis!
I’ve known from the very start that nobody in the world would be more special to me than you. Love you to the moon and back, little bro! Happy birthday!
The best time of the year has come around once again, where I take great pleasure in reminding you that I’ll always be younger than you! Happy birthday!