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100 Best Mother-in-Law Birthday Wishes, Quotes and Captions


When it is your mother-in-law’s birthday and you want to wish her a great day, we have put together a list of all the best mother-in-law birthday quotes and happy birthday wishes for your mother-in-law. We have also included a few birthday Instagram captions for your mother-in-law.

Our Favorite Mother-in-Law Birthday Wishes

I hear today is my mother-in-law’s birthday. Another year older is another year wiser.

When I married your son, I gained a second mother. Don’t tell him, but you are by far my favourite! Happy birthday to my mother-in-law.

You make our family better. Happy birthday to my wonderful mother-in-law!

Our relationship is a lot like Chinese food. Sometimes it’s sweet and sour, and sometimes it’s a little bit too spicy. I wouldn’t change it for anything – it’s still delicious! I am so glad to have a mother-in-law like you. Happy birthday!

Happy birthday dear mother-in-law. Hope you know how amazing, beautiful, wonderful and lovely of a mother-in-law in you are.

Happy birthday mother-in-law! Thank you for your amazing food, all the laughter, and many more memories we will continue to create.

Cupcake with happy birthday to my mother-in-law wishes

Dear mother-in-law, happy birthday! You’re more like a mother to me than anything else. Thank you for treating me just like your own daughter, I’m so lucky to have you.

Happy Birthday to my gorgeous mother-in-law. You’re the best! Cheers to a brilliant day.

When my husband is being an absolute idiot, you are always the first person I call, because you’re the only one who really understands what I’m dealing with! Happy birthday mother-in-law!

Cheers to another trip around the sun! Keep on shining and wishing an amazing birthday to my mother-in-law!

Happy birthday to my mother-in-law! I am so lucky to have joined this wonderful family and you’re just like my mum.

Cheers to my mother-in-law’s own personal new year — let’s make it one for the books!

A great day to celebrate a great mother-in-law! Happy birthday, and cheers to many more.

Cheers to more fun, more memories, and more cake! Happy birthday!

Dear mother-in-law, happy birthday to you! From the first day I met you, you have been nothing but a blessing to my life!

You’re the brightest star in the galaxy! Happy birthday to my mother-in-law!

Cupcake with funny happy birthday mother in law wishes

No ifs, ands or buts about it: You really are the best mother-in-law anyone could have. Happy birthday!

Happy birthday to the best mother-in-law in the whole wide world.

Happy birthday to my dear mother-in-law. Sending you hugs and kisses from far away. Always thinking of you.

Congrats on getting another candle on the cake!

I know it’s weird, but I really enjoy spending time with you! Are you sure we’re doing this mother and daughter in law thing right? Happy birthday to my mother-in-law.

Thank you for always being a mother-in-law I can count on. Happy birthday!

Don’t worry, I already know my present is my mother-in-law’s favorite. Have a fabulous birthday!

Happy Birthday to such a fabulous mother-in-law! Wishing you many blessings for the year ahead.

Wishing my bestie – my mother-in-law the absolute best on her b-day!

Dear mother-in-law, happy birthday! Wishing you the best of health, happiness and good luck always.

I hope you know how much joy my mother-in-law’s presence brings. Happy birthday!

I am truly lucky to be part of your family. To my wonderful mother-in-law, happy birthday with lots of love!

If you like these, you might also want to check out our other lists of Daughter Birthday Wishes, Son Birthday Wishes, Dad Birthday Quotes, Mom Birthday Quotes and Short Birthday Wishes.

Short Mother-in-Law Birthday Quotes for Instagram

“All the world is a birthday cake, so take a piece, but not too much.” — George Harrison

“A mother gives you birth and gives you a life, but a mother-in-law gives you her life.” — Amit Kalantri

“The older you get the better you get.” — Betty White

“You have given me a gracious man with whom I share my life. You are his lovely mother, and I his lucky wife.” — Judy Nilson

“You know you are getting old when the candles cost more than the cake.” — Bob Hope

Cupcake with short mother-in-law birthday quotes for Instagram

“From our birthday, until we die, is but the winking of an eye.” — William Butler Yeats

“Age is an issue of mind over matter. If you don’t mind, it doesn’t matter.” — Mark Twain

“Always remember that you are absolutely unique. Just like everyone else.” — Margaret Mead

“Aging seems to be the only available way to live a long life.” — Kitty Collins

“The mother-in-law is the centre of a family.” – Les Dawson

“Age is something that doesn’t matter, unless you are a cheese.” — Billie Burke

“Growing old is mandatory; growing up is optional.” — Chili Davis

“For all the advances in medicine, there is still no cure for the common birthday.” — John Glenn

“I intend to live forever. So far, so good.” — Steven Wright

Decorations with short birthday party quotes for Instagram

“Youth is a gift of nature but age is a work of art.” — Stanislaw Lec

“You are only young once, but you can stay immature indefinitely.” — Ogden Nash

“The best birthdays of all are those that haven’t arrived yet.” — Robert Orben

“Inside every older person is a younger person – wondering what the hell happened.” — Cora Harvey Armstrong

“The old believe everything, the middle—aged suspect everything, the young know everything.” — Oscar Wilde

“Today is the oldest you have been, and the youngest you will ever be. Make the most of it!” — Nicky Gumbel

“A car is like a mother-in-law – if you let it, it will rule your life.” – Jaime Lerner

“Youth fades; love droops; the leaves of friendship fall; A mother’s secret hope outlives them all.” —Oliver Wendell Holmes

Balloons with happy birthday mother in law quotes by Rapunzel

“Birthdays are good for you. Statistics show that the people who have the most live the longest.” — Larry Lorenzoni

“Birthdays are a great time to stop and appreciate gravity. Sure, it makes things sag as you get older, but it also keeps my cake from flying all over the room so you don’t have to chase it.” — Greg Tamblyn

“Why is a birthday cake the only food you can blow on and spit on and everybody rushes to get a piece?” — Bobby Kelton

“Conscience is a mother-in-law whose visit never ends.” – H. L. Mencken

Happy Birthday Mother-in-Law Captions

  • Happy birthday to the funniest person I know — my mother-in-law.
  • Telling everyone in sight that it’s my mother-in-law’s birthday!
  • Turning my mother-in-law’s birthday into a lifestyle.
  • Move over coffee, today is a day for champagne.
  • Why so many candles for such a small cake? I guess you’re getting old.
  • Life would be a bore without you as my mother-in-law.
  • Here’s to the best birthday for the best mother-in-law!
Cupcake with happy birthday mother-in-law captions
  • My mother-in-law’s birthday should be a holiday.
  • Today, you’re going to party like it’s my mother-in-law’s birthday. Oh wait, it is!
  • It’s my mother-in-law’s birthday and she’s never looked better. Here’s to you!
  • Calories don’t count today because it’s my mother-in-law’s birthday!
  • Life is a journey and you’re enjoying every mile of it.
  • If I appear to be in a great mood today, don’t be alarmed. It’s my mother-in-law’s birthday!
  • My mother-in-law’s birthday is tomorrow…just in case anyone was wondering.
  • Cheers to you! Happy Birthday to my mother-in-law!
  • Work hard. Play hard. Eat cake. That’s now my mother-in-law’s life and birthday motto.
  • Announcement: Today is my mother-in-law’s birthday!
  • I have no shopping budget today, it’s my mother-in-law’s birthday!
  • Life’s too short to not eat cake.
  • My mother-in-law’s birthday week starts…now!
  • It’s my mother-in-law’s favorite holiday…my mother-in-law’s birthday!
  • My mother-in-law is just the right mix of chaos and love.
  • Warning: It’s my mother-in-law’s birthday today!
  • It feels like I’ve only aged 1 year since my mother-in-law’s last birthday.
  • It’s my mother-in-law’s birthday and I’ll eat cake if I want to.
  • You can’t help being cute, You’re the birthday girl.
Cupcake with funny mother-in-law birthday captions
  • Who knew another year could look this good? Aging looks good on you.
  • Gonna party like it’s my mother-in-law’s birthday…’cause it is.
  • Not wasting a single second of my mother-in-law’s birthday today.
  • Making my mother-in-law’s years count instead of counting the years.
  • Taking the day off. It’s my mother-in-law’s birthday.
  • If you’re reading this, it’s my mother-in-law’s birthday.

Messages for Mother-in-Law Birthday Card

  • Keep calm…it’s my mother-in-law’s birthday!
  • My mother-in-law’s birthday, my mother-in-law’s rules.
  • A little birthday party for you!
  • Best. Age. Ever. Happy Birthday to my mother-in-law!
  • Thankful that I can call you my mother-in-law.
  • Found my mother-in-law’s birthday crown.
  • Pop the bubbly, it’s my mother-in-law’s birthday!
  • Peace, love and birthday fun!
  • Birthday vibes all around.
  • Today you’re just a whole year more incredibler.
  • Good news: Today is my mother-in-law’s birthday!
Cupcake with happy birthday card messages for mother in law
  • I can’t stop smiling. It’s my mother-in-law’s birthday.
  • There’s a sort of birthday magic in the air.
  • Let my mother-in-law’s birthday shenanigans begin!
  • I think this will be my mother-in-law’s favorite age yet!
  • Hugs, kisses and birthday wishes.
  • Birthday wishes and butterfly kisses.
  • Did someone say it’s my mother-in-law’s birthday?!
  • It’s my mother-in-law’s birthday and that’s the tea.

So that is it for our list of wishes, quotes and captions. Hopefully you found the perfect one for you.

Now go share your photo!

Woman holding up a clear chunk of ice on the beach

About the Author

Laynni Locke

I am Laynni Locke, a Canadian writer, reader and traveller with a passion for sharing life’s moments on social media. Keeping friends and family in the loop of our lives though photos and videos has become an essential activity for most.

And it doesn’t matter if you are travelling, celebrating a special occasion or just appreciating day-to-day life, when you take that perfect photo you are going to need the perfect caption or quote before you share it. Which is why we started Routinely Shares, providing comprehensive lists of quotes and captions to cover every occasion, adventure or loved one.

With extensive experience as a travel writer, social media specialist and grant writer, I have made it my mission to curate the best and easiest to use lists for your next post.

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