Few people are as thoughtful and caring as you are, and even fewer are as genuine and lovely as you. I feel very blessed and privileged to have you in my life and as a sister.
Enjoy your special day, sis. I’m sending my very best birthday wishes to you today.
Celebrating your birthday is especially important because you’re not just my sister-in-law, but a true sister and a thoughtful friend. May you have a special and touching birthday.
Having a sister-in-law like you in my life has been truly inspirational for me. I greatly admire the wonderful woman that you are, sis. Happy birthday to you.
It’s so wonderful to be able to call you sister, but really the truth is that even before you were my sister-in-law, you were already a good friend to me and a dear sister at heart.
I’m wishing you the very happiest birthday today, sis!
The day that you officially became my sister-in-law was a particularly special and happy day but truth be told, you had touched my heart and were already a sister to me long before then.
I hope that your special day today warms your heart just as you have mine.
I never dreamed that I would have such a meaningful and heartfelt blessing for a sister-in-law like that I have in you. I am so thankful for having someone as special and as wonderful as you in my life; you truly are a dream come true.
I truly believe that we would have a very special bond and a strong friendship had we just met randomly as friends, but the fact you married my brother making us family is even better than I could’ve ever imagined, as now I get to call you my sister!
Enjoy your special day, and may your heart always be filled with happiness and love!
However much we see each other as the years pass, know that I cherish our moments together and you’ll always be a very special sister-in-law to me. Happy birthday, dear.