21. When you need someone to be there for the most important parts of your life just call me, and I will come running. Good or bad it doesn’t matter because there is no moment I will not be there for you.
22. Sister, you were the first best friend of my life and you’ll remain my BFF. Wishing you a happy birthday.
23. Sister, no other person could ever hold a candle to you, because you are too hot to handle! Happy birthday to my older, lovely, and feisty sister.
24. I’m so thankful to have a sister like you to share life’s ups and downs with. Thanks for always being there for me and making each day so much fun! I hope you have a very happy birthday!
25. Sister, it's your birthday. Keep calm and eat cake!
26. I wish you all the happiness your birthday can hold, my dear friend!
27. My sister is an abundant giver, constant encourager, eager listener, and inspiring dream chaser. Here's to you!
28. Sending birthday love to my amazing sister-in-law!
29. You really are the sweetest person I know. I promise to keep all of your secrets and be there for you each day. Happy birthday!
30. We laugh, we cry, we make time fly. We are best friends, my sister and I.
31. No one can heal my pains and make me happy with a hug like you. Thanks to my sister for being around me always. Let me hug you for once on this special day of your life. Happy birthday.
32. I can’t imagine being on this journey through life without a sister as cool as you. Thank you for everything. Happy birthday!
33. The best sister and best friend I could ask for! Love you so so much!
34. I feel like I won the jackpot when it comes to siblings. Words simply aren't enough.
35. Sisters are a lot like toppings on ice cream: you can get by without them, but where's the fun in that? Thanks for sweetening my life with your love. Happy birthday!
36. Sisters like you are diamonds. They sparkle, they are priceless, and they are truly a woman’s best friend. Happy birthday, sis.
37. People say that it is the thought that counts, so I want you to know that I really thought about giving you lots of lovely things for your birthday - like that top you wanted, and those cool shoes. However, this card will have to do as I'm totally broke! I still love you lots! Happy birthday and hope you have a brilliant day!
38. A sister is someone who loves you for who you are, not who you pretend to be.
39. Wishing the happiest birthday to the world’s coolest sister. Thanks for always letting me tag along, and being there when I need you.
40. I am so grateful you're my sister, I can't imagine life without you! Thanks for being amazing! Have a great birthday!