21. Having an amazing sister-in-law like you is more precious for me than thousands of friends. Happy birthday, my beautiful sister-in-law.
22. The greatest gift of all is to have you as a sister-in-law. Wishing you a happy new year filled with all the great things you coold ever ask for.
23. “Sisters don’t need words. They have perfected a language of snarls and smiles and frowns and winks – expressions of shocked surprise and incredulity and disbelief.” —Pam Brown
24. Having you as my sister-in-law is a wish come true. I hope you have a wonderful year with all your wishes fulfilled. Happy birthday!
25. Happy Birthday to my amazing in-law sister. I'm thinking of you with love and wish you a day filled with all the most lovely and precious moments.
26. Today is one of the most beautiful days because it is your birthday, dear sister-in-law. Happy birthday. You have taught me many things in my life, cared for, and loved me like your own sister. I am grateful to you. Love you lots.
27. You are adored a lot by us, dear sister-in-law. You are a sweet and wonderful birthday girl who is impossible to find. Happy birthday.
28. Woohoo, it is your birthday today, sister-in-law. Many happy returns of the day. Where’s the bash? Today, we are sure to have a wild party and support wildlife.
29. My brother has done many craziest things, but he was forgiven when he brought an incredible person like you into our family. Happy birthday, my dearest sister-in-law.
30. A heart of love. A sympathetic nature. I want you to have a day you'll never forget since you are such a lovely person. Greetings on my sister-in-birthday! law's
31. Happy birthday, my dearest sister-in-law. I hope every moment of your life is filled with prosperity and happiness. You will always be in my prayers. Wish you have a magical day!
32. May your day be filled with laughter, treats, and goodies. We cherish the time spent with you, my dearest god-given sister.
33. Happy Birthday to my sister-in-law. With your smile, you brighten every day! I wish you the best surprises both today and always.
34. May you enjoy today, and may the days that come be foll of surprise and beauty. Happy Birthday, in-law sister!
35. Sending you the best wishes as you celebrate another year of being the stunning, lovely you, dear sister-in-law. Birthday greetings!
36. You have come into my life as a spirited friend and a dear gift. Happy birthday, dear sis-in-law.
37. Happy birthday sister-in-law, for surviving another year with my brother.
38. Congratulations on making it to the short list of people I don’t need a reminder to remember—happy birthday and lots of love to you, my fabulous sister-in-law.
39. May this birthday be the most joyful and unforgettable day in your life—a happy special birthday, sister-in-law.
40. Birthday greetings. Thank you for being my sister-in-law. People around you benefit from your happiness and excitement. I wish you love and joy in the upcoming year.