I’m sending the very best birthday wishes your way today, my adorable little cousin sister! May your special day be a beautiful one full of love, joy, and happiness!
Happy birthday to my favorite gal pal! We might come from different parents, but two friends like us will always be so much more like sisters than anything else!
My beautiful sister, you have a heart of gold and a soul so sweet that it’s only right you have the most magnificent birthday this year. Happy birthday to you.
No matter how old we grow or how far apart from one another we may be, you will always be the most special sister to me. Happy birthday, dearest sister.