181. Even when no one else shows concern or care, a sister is someone who’ll always be there. Happy birthday.
182. If only everyone had an amazing sister like you! The world would be a much better place. Happy birthday!
183. Each year, I feel more and more grateful for you. Happy birthday, I love you so much.
184. You're finally 21! Now you can legally do all those things that you've been doing since you were 16! Happy birthday!
185. Thank you for all the years of friendship, sis. You are my best friend, and your loyalty is always appreciated. May your birthday be filled with wonderful surprises and amazing gifts.
186. Having a sister is like being blessed with two of everything. Two closets, two sets of makeup, and two hearts that are always connected. Thanks for always sharing your things with me even when you didn't want to. Happy birthday!
187. A sister doesn't just know your story. She helped you write it!
188. Sisters are like diamonds. They're rare, sparkle beautifully, are absolutely priceless, and they are truly a girl's best friend. May you always shine brightly sis, today on your birthday, and every day!
189. To the strongest, most beautiful, inspiring sister I know—happy birthday!
190. My heartfelt birthday wishes go out to my dearest sister. May all your dreams and aspirations come to fruition on this special day of yours!
191. Sisters may drive you crazy, but they are the ones who know you best and always have your back.
192. I am so lucky to have such a sweet and wonderful sister like you! I hope that your day is full of joy, and that you have a very special year ahead. Happy Birthday!
193. Sis, for all the times you defended me when we were kids and consoled me as an adult, know that I am truly thankful. I could ask for no better champion in life than you. Happy birthday!
194. A sister is an amazing person: she knows you inside out but loves you anyway.
195. I hope this birthday celebration will mark the start of a year full of happiness, memorable moments and dreams coming true.
196. The best advice my mother ever gave me: Be nice to your sister. Your friends will come and go, but you will always have your sister. And I promise that one day she will be your best friend.
197. Happy birthday to the funniest, prettiest, happiest person I know - you! I hope you have a great day my dear sister, and may life bring you much joy and prosperity.
198. Over the years we may have had disagreements and petty fights, but that’s just what sisters do. We’ve also had deep discussions and loving moments. I’m glad I have such a wonderful sister who keeps my life real and never boring.”
199. Wishing a happy birthday to my favourite sister!
200. Here's to a wonderful birthday and an amazing year ahead - I hope all your dreams come true! Happy Birthday, sister!