- Happy birthday sister! Thank you for being such and supportive sister and best friend. I love you!
- Happy Birthday, sister! Thank you for always being such an amazing sister!
- You are a blessing in my life. Happy birthday, little sister!
- Happy birthday sister! I am very fortunate to have such a caring and loving sister like you. I want to thank you for everything.
- Thank you for being the most loving and caring sister of the whole wide world! Wishing you a very happy birthday, dear sister!
- You are the best sister anyone ever had. And I am lucky to have you. It’s a special day. Happy birthday sister!
- Happy Birthday, sister! Sending all my love and prayers! May you have a blessed year ahead! Many happy returns of the day.
- You are literally the best sister ever. Happy birthday to the most awesome sister ever!
- On this special day, I want you to know that you are the sweetest and loveliest sister in the world. I love you so much. Happy birthday!