Happy Birthday, Sister-in-Law: 50 Wishes to Make Her Smile

Smiling sisters hugging

Your sister-in-law might be your buddy, your confidant, and a bonus family member who you adore. You and she might also have a relationship that has had its fair share of trials and tribulations. But through it all, you continue to support one another. No matter the dynamic between you, there is bound to be a happy birthday sister-in-law quote that fits the bill.

Sentimental Happy Birthday Sister-in-Law Quotes

She isn't your birth sister, but she is one of the most important people in your life. Tell her that you love her on her special day with a quote made just for her.

  • Happy birthday to a sister who makes me smile every day.
  • Birthday wishes to my favorite bonus family member!
  • Happy birthday wishes for a sister from another mister.
  • Wishing you a birthday full of love, dearest sister-in-law.
  • Sisters-in-law like you make family worthwhile. Happy birthday!
  • You make my brother happy, but you make me even happier. I love you, birthday girl.
  • You are so special to us sister-in-law. This family wasn't complete until you came along. Happy birthday!
  • No one deserves a more special day than you. Eat cake, drink wine, and leave the chores to my bro!
  • Sister-in-law, you are truly one in a million. We are blessed to have you in our family. Happy birthday.
  • You are so much more than a sister to me. You are also my best friend. Happy birthday, sister-bestie!
  • Happy birthday to a sister that always puts a smile on my face.
  • Over the years we have fought, loved, and grown. I'm so proud to have you as a sister-in-law.
  • You are the flower in our family garden. Happy birthday to a wonderful sister-in-law.
  • You walked down the aisle with her and walked straight into our hearts. Happiest birthday to an incredible sister-in-law.
  • You captured her heart and then you captured ours. Happy birthday from your favorite siblings-in-law.
Two young beautiful woman hugging with present

Hilarious Happy Birthday Sister-in-Law Quotes

Together you are goofy, fun, and trouble with a capital T. These suitable sister quotes fit your relationship with your sister-in-law perfectly.

  • Being related to you makes family get-togethers totally tolerable. Cheers, dear sister-in-law.
  • You put up with my brother and therefore are the strongest woman that I know. Happy birthday, sister-in-law.
  • We thank our lucky stars for you every day. Without you, my sister would be lost (and still living at home.) Happy birthday!
  • It takes a strong (or crazy) woman to handle my sibling. Happy birthday to a woman with superhero strength.
  • Here's to hoping my brother channels all of his manners and treats you like a Queen on your special day.
  • Happy birthday to the single best decision that my sister ever made.
  • So glad I never got stuck with an evil sister-in-law. Happy birthday to the very best.
  • Hope that your wishes of no dishes gets granted on this day sister-in-law. Enjoy your birthday.
  • I always thought that you were nuts for wanting into this family. I'm so thankful that you're a little bit crazy. Happy birthday crazy lady.
  • Today is your day to be a princess. Make my sibling your ultimate servant sister!
Smiling women having fun and making a toast

Quotes From a Brother-in-Law

Who would have thought that having ANOTHER sister would be so much fun? Your sister-in-law ended up being a perfect addition to your family, so tell her so on her birthday.

  • I never thought that getting stuck with an annoying little sister would be such a gift. Happy birthday to an awesome sister-in-law.
  • Sister, you are totally my favorite sis. Yes, I know you are my only sis. Happy birthday to my number one.
  • I never wanted a sister, but now that I have you in my life I didn't know what I was missing, Happy birthday to a funny and charming sister-in-law.
  • Thanks for taking care of my brother, heaven knows he needs all the help that he can get! Happy birthday to you sister-in-law.
  • Thanks for choosing to be a part of this family's crazy sister-in-law!
Men and woman shouting and having fun

Quotes From a Sister-in-Law

Sisterhood is a special bond and you are so lucky to have scored a bonus sis in your sibling's wife. On her birthday, let her know that without her, life would be so much more blah.

  • We don't share blood, but we share a heart. Happy birthday, dearest sister-in-law.
  • A sister bond is unbreakable. I'm blessed to walk through life with you, birthday girl!
  • As children, we didn't get to share clothes, but as adults, we share an unbreakable bond. We love you, sister-in-law.
  • Looking forward to a lifetime of memory-making with a fabulous sister-in-law. Have a special day.
  • I wasn't thrilled to share my throne with you at first, but now I love been the queens of the family together. Happy birthday, sis!
  • Sisters are masters at keeping each other's secrets. Don't worry sister-in-law, your real age is safe with me!
  • Life is so much more fun with a sister. Have a special day sister-in-law.
  • A sister is a friend you can't get rid of. I don't ever want to be rid of you birthday girl!
  • I'll always be there to help you sister, but when it comes to issues with my brother, that is all you! Happy birthday and best of luck.
  • As different as we are sister, we will always have a common goal of driving my brother crazy.
Women With Birthday Cake celebrating

Choosing A Birthday Quote

It doesn't matter if it's her 31st birthday or she's turning 80. When choosing a birthday quote, the most important thing is to pick one that highlights the relationship. Choose a sentiment that compliments your personality as well as hers. If your relationship is a silly one, pick a humorous greeting. If your sister-in-law tends to be on the serious side, send a birthday wish that speaks to that. Make sure that whatever greeting you send her way exemplifies honesty, truth, and the love that you have for her.

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Happy Birthday, Sister-in-Law: 50 Wishes to Make Her Smile