- Happy birthday, stepsister! I hope you have a fantastic day.
- I’m so glad we’re family. I hope your birthday is as wonderful as you are.
- I’m so happy you were born! You make our family complete.
- You’re such a special person and I’m so lucky to be able to call you my stepsister.
- Wishing you a very happy birthday full of all the things you love!
- You’re such a kind and caring person, and I’m so proud to call you my stepsister.
- May your birthday be as wonderful as you are!
- I hope this birthday is one you’ll never forget.
- Have the best birthday ever, stepsister!
- Sending lots of love your way on your special day!
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