Here is a list of the 101 best sister-in-law birthday messages and quotes to make her feel special on her big day.
#1 You’re more than a sister-in-law…you’re a sister to me. I don’t know what I would do without you as part of the family. Wishing you a very happy birthday full of pampering, relaxation and love!
#2 Pour the champagne! The world’s greatest sister-in-law is having a birthday!
#3 Pour the drinks, light the candles, and fill up the bubble bath. It is your day to take time for yourself and let your hubby handle everything else! Happy birthday, my extraordinary sister-in-law!
#4 Life is a million times more fun with a sister-in-law as cool as you. Thanks for always making us laugh with your great sense of humor. I look forward to getting together again soon. Have a very memorable birthday and a fantastic next year of your life!
#5 Words can never express how grateful I am to have a sister-in-law as giving, caring, and kind as you. You have made my life immeasurably better by becoming a part of my life. I wish you a birthday that is as wonderful as you are!
#6 Happy birthday to the world’s most talented sister-in-law! It is amazing to see how you get so much accomplished, professionally and personally. I am learning a lot from you!
#7 I am so lucky to have such a soft-hearted sister-in-law. Every day, in so many ways, you add invaluably to our lives. Thank you for your selfless devotion to the family. Happy birthday!
#8 If I could have picked out the perfect sister-in-law, it would have been you! Thank you for being who you are. I love having you as a “sister.” I hope you have a phenomenal birthday and look forward to seeing you soon.
#9 To my sister-in-law on your birthday: The three words I would use to describe you are awesome, awesome, and AWESOME! I hope your day is stress-free and full of love.
#10 I’m so very lucky to have a sister-in-law who is more than a sister-in-law…you’re a best friend, too. Happy birthday.
#11 Dear sister-in-law: You are truly one of a kind. Your heart of gold, sense of humor, and sparkling personality are such treasures to me. Happy birthday.
#12 To my sister-in-law on your birthday: Today and always, you deserve the best. You’re simply amazing in all that you do.
#13 To my sister-in-law on your birthday: Thank you for being your wonderful self. You bring sunshine and laughter everywhere you go. Happy birthday.
#14 To my sister-in-law: I hope your birthday is filled with all the best the world has to offer. May all of your dreams come true, today and always.
#15 My sister-in-law deserves all the love and joy the world can bring. Thank you for being such a considerate and supportive soul. Happy birthday.
#16 Wishing a happy birthday to my beautiful sister-in-law. You’re such a caring, kind, and loving person, and I’m so grateful to know you.
#17Three cheers for an awesome sister-in-law…hip, hip, hooray! You make family occasions so much better, and I love knowing that you are just a phone call away. May your birthday be filled with all your favorite things.
#18 To my sister-in-law on your birthday: Someone as extraordinary as you deserves all the magic a day can bring. Happy birthday!
#19 You’re not just a sister-in-law…you’re a sister. Thank you for being such an essential part of my life. Happy birthday.
#20 Wishing my sister-in-law a day filled with love, light, and laughter. Simply put, you’re a phenomenal human being. Happy birthday.
#21 Happy, happy, happy birthday, to a sister-in-law who makes every day an adventure. May your day be filled with fun and laughter.
#22 How thrilled I am to have a sister-in-law as warm, dependable, and caring as you. Today and every day, you deserve the best. Happy birthday.
#23Sending you my most loving thoughts and wishes on this cherished day! Thank you for showing us what virtues an outstanding sister-in-law can bring into our family! Thank you and happy birthday!
#24 Happy birthday, to a sister-in-law who charms everyone she meets. We’re all so lucky to have you as part of the family. You’re simply a treasure.
#25 Every moment spent with my sister-in-law is AWESOME. Happy birthday…you’re the best!
#26 Wishing a quiet and relaxing birthday to a sister-in-law who’s one of a kind! I’m so lucky to have you in my life. Happy birthday!
#27Dear sister-in-law, may this birthday bring you joy and fill your life with beauty and wonder, just as you have filled our lives with these admirable qualities! I hope you spend today with a smile from ear-to-ear. Enjoy your birthday!
#28Wishing the happiest of birthdays to one of the greatest people I know. Never stop being the cheery, wonderful, strong and brave woman we all have grown to know, respect and love! Happy birthday! Here’s to you, an incredible sister-in-law.
#29 Wishing the happiest birthday to my sister-in-law. You’re such a kind and giving person, and I’m so thankful to know you.
#30 Wishing all the best the world has to offer on my sister-in-law’s important day! I love you and am glad to know you. Happy birthday.
#31 Wishing a warm and happy birthday to my sister-in-law. You’re a true member of the family, and I’m so lucky to have you in my life.
#32Sending my sister-in-law warm wishes on your special day. You’re such a loyal and supportive soul, and everyone in the family appreciates all you do. We are lucky to have you. Happy birthday!
#33 Dear sister-in-law, from the day we met, you’ve become like a sister to me. Wishing you all the very best today. Happy birthday.
#34It truly is fantastic to be able to have such a wonderful sister-in-law. I hope that you will have an absolutely unforgettable birthday today. You deserve it! I am extremely grateful to be able to celebrate today by your side!
#35 Happy birthday, to my kind and beautiful sister-in-law. Thank you for being your thoughtful, compassionate, caring self each day.
#36I am and always will be immeasurably grateful for your coming into our lives, dear Sister-in-Law. You have brought us happiness and content beyond measure. For that, I wish and hope that the coming year is filled with love and joy for you! Happy birthday!
#37 Pour the champagne, light the candles, and make a wish…it’s my sister-in-law’s special day. Happy birthday!
#38 Wishing a happy birthday to my loving sister-in-law. You are the glue that holds our family together, and we’re all so lucky to be in the same family with you.
#39 Dear sister-in-law: Thank you for being a friend, a sister, and a member of the family. Today and always, you deserve the best. Happy birthday.
#40 Wishing a very happy birthday, to a sister-in-law who’s cooler than cool. Thank you for all the little ways you bring joy and laughter to the family.
The Most Famous Quotes to Include with Your Birthday Message to Your Sister-in-Law
“A sister is a gift to the heart, a friend to the spirit, a golden thread to the meaning of life.”
“A loyal sister is worth a thousand friends.”
“In thee my soul shall own combined the sister and the friend.”
“Sweet is the voice of a sister in the season of sorrow.”
“You mess with my sister, you’re messing with me!”
“God sent me an angel when he gave me you as a sister.”
“Help one another, is part of the religion of sisterhood.”
“Unconditional love; the definition of sister.”
“How do people make it through life without a sister?”
“Your sister is a jewel, a priceless, one-of-a-kind gem who makes living precious for many people, including you.”
“One’s sister is part of one’s essential self, an eternal presence of ones’ heart, soul and memory.”
“I could never love anyone as I love my sisters.”
“She is the mother I never had, she is the sister everybody would want. She is the friend that everybody deserves. I don’t know a better person.”
“Sisters function as safety nets in a chaotic world simply by being there for each other.”
“When sisters stand shoulder to shoulder, who stands a chance against us?”
“What are sisters for if not to point out the things the rest of the world is too polite to mention.”
“Sisters become more beautiful as each day passes by.”
“During life’s highs and lows, hurts and happiness, a sister is always there.”
“Is solace anywhere more comforting than in the arms of a sister?”
“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.”
“A sister can be seen as someone who is both ourselves and very much not ourselves – a special kind of double.”
“A sister is a friend you don’t have to avoid the truth with.”
“Sister. You are not only a strong woman, you are the strongest tie to the best years of my life.”
Melanie J. Pellowski
“When I was discouraged, my sister encouraged. When I had doubt my sister would shout, you can do it, do not quit.”
“You know full well as I do the value of sisters’ affections; there is nothing like it in this world.”
“You don’t love someone because they’re perfect, you love them in spite of the fact that they’re not.”
“Sisters examine each other so that they can have a map for how they should behave.”
Michael D. Kahn
“Sisterly love is, of all sentiments, the most abstract. Nature does not grant it any functions.”
“Parents die, daughters grow up and marry out, but sisters are for life.”
“Sister we don’t know what the future holds but we always know we are there for each other.”
“I would like more sisters, that the taking out of one, might not leave such stillness.”
“Friends grow up and move away. But the one thing that’s never lost is your sister.”
“Having a sister is like having a best friend you can’t get rid of. You know whatever you do, they’ll still be there.”
“The mildest, drowsiest sister has been known to turn tiger if her sibling is in trouble.”
“If your sister is in a tearing hurry to go out and cannot catch your eye, she’s wearing your best sweater.”
“A sister is both your mirror—and your opposite.”
“One of the best things about being an adult is the realization that you can share with your sister and still have plenty for yourself.”
“What’s the good of news if you haven’t a sister to share it?”
“My sisters are my favorite people on earth.”
“My sister is my hero.”
Patrick J. Adams
“You may be as different as the sun and the moon, but the same blood flows through both your hearts. You need her, as she needs you.”
George R.R. Martin
“Acquaintances were always on their best behavior, but sisters loved each other enough to say anything.”
“An older sister is a friend and defender – a listener, conspirator, a counselor and a sharer of delights. And sorrows too.”
“Husbands come and go; children come and eventually they go. Friends grow up and move away. But the one thing that’s never lost is your sister.”
“There is no place for secrets in sisterhood.”
“A sister is like yourself in a different movie, a movie that stars you in a different life.”
“The best thing about having a sister was that I always had a friend.”
Cali Rae Turner
“I’ve known every love possible, but as the years stretched out, the love I longed for the most is the one I shared with my sister.”
“For there is no friend like a sister in calm or stormy weather.”
“Don’t talk about my sister; don’t play with me about my sister. If you do, you’ll see another side of me.”
“Sisters make the best friends in the world.”
“There can be no situation in life in which the conversation of my dear sister will not administer some comfort to me.”
Mary Worley Montagu
“Sisters are best friends, they are advisors, they are teachers, and best of all they are people with whom you can talk with about anything – someone you have a special bond with!”
“Yes you can, sister!”
“She is my sounding board, my confidante, my keeper of secrets – and my best friend.”
“Between sisters, often, the child’s cry never dies down. ‘Never leave me,’ it says; ‘do not abandon me.'”
“Appreciation I send to you my sister, for always being there, for your support and encouragement. On you I can always count.”
“Sisters share the scent and smells – the feel of a common childhood.”
“To have a loving relationship with a sister is not simply to have a buddy or a confident…it is to have a soul mate for life.”
“She is your mirror, shining back at you with a world of possibilities. She is your witness, who sees you at your worst and best, and loves you anyway.”
“It’s hard to be responsible, adult and sensible all the time. How good it is to have a sister whose heart is as young as your own.”
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Keith Miller has over 25 years of experience as a CEO and serial entrepreneur. As an entrepreneur, he has founded several multi-million dollar companies. As a writer, Keith's work has been mentioned in CIO Magazine, Workable, BizTech, and The Charlotte Observer. If you have any questions about the content of this blog post, then please send our content editing team a message here.