1. Happy birthday! I’m so glad that my brother chose you. He gets a wonderful partner for life and I get a fantastic sister-in-law and BFF.
2. Even though we are completely different, we care about the same things and have the best time together. You’re the best sister-in-law a girl could ever have. Happy birthday!
3. I cannot fully express in words what you mean to our family and me. There’s nothing I can write that would do justice to who you are. All I know is that our lives would be much emptier without you! Happy birthday, my precious sister-in-law!
4. You add something so special to our family: you. I must be blessed to have you in my life not only as my sister-in-law but also as my dearest friend. Have a truly special birthday.