I know that my brother treats you like a queen, so instead, I will treat you like a princess. I plan on spoiling the mess out of you on your big day, Sister-in-Law. Prepare for lots of cake and wine from your adoring brother-in-law. Happy birthday!

I am so grateful that I have such a splendid sister-in-law. I hope that your birthday is as extraordinary as you are and that our bond continues to grow stronger every year.

I couldn’t have asked for a better sister-in-law, because you are calm, cool, and captivating. How my brother managed to trick you into marrying him is still a mystery to me, but I am glad you fell for whatever it was! Happy birthday to my remarkable sister-in-law!

Sister in laws are like muffins in a bad day. They make you all warm and fluffy inside, chasing the bad vibes away.

Now that my brother is married, he seems to have lost his spot as the family favorite. I’m not sure if my parents or I love you more, but either way, good job uprooting my brother! Thank you, and may your birthday be full of scrumptious food and delightful people.

Sister-in-Law, there are several things that I want to take the time to thank you for: for always letting me confide in you like a real sister, for comforting me when life wasn’t going my way, and for loving me as much as you love my brother. I am eternally grateful to have you in my life.

I’ve always criticized my baby brother’s choice in women, but when he met you, I was elated. I knew right away you were an extraordinary person, and I am so glad that he somehow tricked you into marrying him! I hope your birthday is as joyous and sweet as you are.

You are such an unselfish, compassionate, and loving person, Sister-in-Law. Honestly, I’m not sure how my brother landed such a catch! But I am glad he did because it enabled us to become such good friends. May your birthday be full of many amazing memories.

Thank goodness you married my brother, because now you can take over the job of spoiling your nieces and nephews. He does a great job, but I know that you are going to be even better at it because I’ve experienced being spoiled rotten by you first-hand!

Now I understand why my husband is such a gentleman who is so respectful of women. That is because he has grown up with a wonderful sister like you. Happy birthday sister-in-law.

My brother has done a lot of stupid, crazy things in his life, but marrying you was not one of them. In fact, it might be the only smart thing he has ever done! Thank you for becoming a part of our family, and may you have an enjoyable birthday full to the brim with hope and delight.

Sister-in-Law, your birthday is a truly momentous occasion. Not only is it a celebration of the day you were born, but it is a yearly reminder that you deigned to say “yes” to my baby brother and became a member of our family. Thank you for keeping him sane and for treating me as a sister.

To the person with so much love and care for all the people in her life – wishing you a journey ahead filled with happiness and hope. Happy bday, my sister-in-law!

Wonderful bday to you my amazing sister, you are the greatest gift that life gave to me after marriage.

Sister-in-Law, you have always gone out of your way to include me in your life, and I want you to know that I appreciate you so much. Your caring, warm, and generous nature has warmed my soul. May your birthday be a momentous, joyous, and prosperous occasion.

The road ahead may be filled with challenges but I know that the strength in your heart will get you through it. Happy birthday, my dearest sister-in-law!

Thank you for making our family stronger by being in it. You are a loving wife and an amazing friend. I am so blessed to have such a genuine and sweet person as a sister-in-law.

When I got married I feel like I won the jackpot with having you as my sister. Happy birthday I love you so much.

Wishing you the most magnificent, amazing, incredible, sensational, talked-about and brilliant B-Day! You deserve it!

No gift could ever compare to the one you have given me: family. Thank you for being an incredible wife, a marvelous mom, and a fantastic friend to me. Happy birthday!

I adore you as a person, confide in you as a friend, and love you as a sister. You make my life better with your presence, and I hope that you always feel surrounded by peace and love.

Sister-in-Law, do you know how thoughtful, cool, generous, and awesome you are? The answer: very. I’m absolutely overjoyed that such an amazing person married into my family, and I hope that you have a magnificent birthday, year, and life. Happy birthday!

It boggles my mind that there are people who don’t like their sister-in-law. But they must not be blessed with a considerate, loving, and supremely likable sister-in-law like I am. I am grateful that you are a part of my family, and I hope that you have a marvelous birthday.

Not only was I blessed with a great husband, but also with an awesome sister-in-law. Life gave me a wonderful package deal! Best birthday!

Happy birthday to the woman that I cherish like a little sister: my adorable sister-in-law. I see now that intelligence, cuteness, and prettiness run in the family, and I am so happy that not only do I have an amazing wife, but an amazing sister-in-law as well.

May your special day be full of astounding discoveries, magical moments, and lovely surprises. You deserve all these things and more. Happy birthday to an incredible woman: my sister-in-law.

I don’t need Facebook to remind me that it’s your birthday, Sister-in-Law. Who could ever forget such a talented, intelligent, and beautiful woman’s birthday? May your day be truly spectacular.

Sister-in-Law, you seem to have a special gift in life: attracting positive, amazing, and good-looking people. First my brother, and now me. You are certainly lucky. Although to be fair, you are all those things too! Happy birthday from one amazing person to another!

I was so worried when my big brother married you because I thought that you would take my place in his heart. But now I realize how foolish I was because you have only made his heart bigger with your love. Thanks for always including me and making me feel doubly loved.

You are like a sister to me and a friend rolled in one. We share so much about life and how we triumphed over it. I can’t imagine being out of reach with you for so long! Hope to see you soon, my sister-in-law! Wishing you a memorable and wonderful birthday!