Happy birthday, my dear friend! You know that I just want your happiness and I hope very much that all your dreams come true. Regardless of whether you are no longer my sister-in-law, I still see you as part of the family!
Our bond is already in place and nothing will be able to undo it. You live in my heart and you can always count on me for whatever it takes. You are a wonderful person and I make a point of always having you in my life.
Congratulations dear! All the best and I hope you enjoy your day a lot!