Happy birthday, little brother! You might be jealous of your big sister in many ways, but I’ll always be envious of the fact that you’ll always be younger than me!
You may well be my stepsister, but you mean more than just that to me. Our bond runs deeper and that’s why you’ll always be my soul sister. Happy birthday.
My beloved twins, there is no other brother and sister quite like you both. You make everyone happy just by being with you. May you have a great birthday!