250+ Birthday Wishes For Your Sister-in-Law

You’re officially too old to drop it like it’s hot,
so please just sit down like it’s cold.
Happy birthday, sister!

Cue the cocktails, sis!
It’s time to celebrate your special day!

Thanks for being the best gossip in the fam.
Childhood would have been so boring without you!

Happy birthday to the person who always steals my clothes.
For my birthday, I’d like them back!

I’m sorry I called you old.
I really thought you knew…
Happy birthday!

Happy birthday to my sister.
I love you enough to get you this folded piece of card.

I think me being your sister is enough of a gift.
You’re welcome!

You may be the queen today,
but remember who wears the crown the other 364 days!
Happy birthday, sister.

I can’t believe you married into this wacky family.
Guess you’re just as wacky as us!
Happy birthday, sister-in-law.

Happy birthday to the person
who will always be older than me.

You may be the older sister,
but I’ll always be the smartest!
Happy birthday!

The best part of being your sister
is having a best friend almost as pretty as me.
Happy birthday!

You’re the jelly to my roll.
Happy birthday, sister!

I’m pretty sure I’m the favorite daughter,
but since it’s your day, I’ll let you think otherwise.
Happy birthday, sis!

Being your sister is really the only gift you need.
Happy birthday!

You may be the older sister,
but you know who’s the boss!
Happy birthday, sissy!

They say the older you get, the wiser you become.
At this point, you must be one of the wisest on earth.
Happy birthday, sister!

Happy birthday to my former womb mate!

You may be the younger one,
but I’ll always be the best-dressed sister.
Happy birthday!

Don’t forget who knows all your secrets.
Give me the biggest slice of cake!
Happy birthday, sister.

No matter how old I get,
I’ll always be younger than you!
Happy birthday, sister!

I knew your party would be lit,
but with all these candles we may need the fire department!
Happy birthday!

Same size, same clothes, same style.
Happy birthday to my fellow fashionista!

Let’s party like it’s your birthday!
Oh wait, it is!
Happy birthday, sis!

Screaming happy birthday
to the one who gets me!

No one can make me laugh like you do,
especially when I look at your face!
Happy birthday, sister.

I’m really just here for the cake.
Oh yeah—happy birthday!

I’m excited to grow old with you,
and happy you have a head start.
Happy birthday!

Because it’s your birthday,
I’ll let you eat the first slice.
Happy birthday, sis!

I guess your birthday wish came true
because you have me as your sister!

You may be a year older,
but I’m not sure you’re wiser.
Happy birthday!

For your birthday I got you a fruit salad.
With grapes… lots of fermented grapes!
Cheers!

A very happy,
sassy,
classy birthday, sis!

You’re the best childhood roommate
anyone could ask for.
Happy birthday!

Calling you the best sister in the world
is just scratching the surface.
Happy birthday!

You take the cake, sissy!
Happy birthday!

I adore you today and always.
Happy birthday, queen!

You’re simply the best.
Happy birthday, sister!

No one compares to you.
I love you.
HBD!

Thanks for being my first bestie.
Happy birthday!

Happy Birthday, sister!
I love you.

Happy cake day, sissy!

You rock!
Happy birthday, sister.

You’re the icing to my cake.
Happy birthday, sister!

Happy birthday to my best friend.

Happy cake day, sister!

Cheers to another year around the sun.
Happy birthday!

Happy birthday, dear sister.

Wishing the best sister in the world
a very happy birthday.

I’m so proud to call you my sister.
Happy birthday!

You mean so much to me.
Happy birthday, sister!

Sisters are the best gift.
Happy birthday!

Happy birthday, built-in bestie!

My sister is better than your sister.
Happy birthday, sissy!

You’re the best sister a girl could ask for.
HBD!

Happy birthday to my best friend!

Wishing you the best birthday ever, sis!

To my favorite sister,
happy birthday!

Thinking of you today and always.
Happy birthday, sister!

I’m so lucky to be your sister.

I can’t wait to celebrate with you.
Happy birthday!

Let the party begin.
Happy birthday, sis!

You make life sweeter.
Happy birthday, sister.

You’re simply the best!
Happy birthday, sissy.

I love you so much!
Happy birthday to my best friend.

Happy birthday to the most wonderful sister in the world!

Happy birthday to my shining star.
May your day be as remarkable as you are.

Happy birthday, dear sister!
May your special day be as beautiful and extraordinary as you are.

There’s not a day that goes by
that I don’t thank my lucky stars you’re my sister.
Happy birthday!

Sibling love today and always.
Happy birthday, sister.

Today we celebrate the one
who brings so much joy to our lives.
Happy birthday, sister!

Through good times and bad,
you’re the best sister I could ever have.
Happy birthday!

Nothing makes me happier than seeing you smile.
Wishing you the best birthday yet!

When you blow out your candles,
I hope all your wishes come true.
Happy birthday, sissy.

You were my first friend
and will always be my best.
Happy birthday, sister!

Sisters speak a language
only we understand.
Happy birthday!

You are one of my biggest inspirations.
Happy birthday, sis!

Sister bonds are one-of-a-kind.
I’m so grateful for ours.
Happy birthday!

I’m so lucky to have a beautiful,
kind-hearted sister like you.
Happy birthday!

May today bring you love and blessings,
today and always.
Happy birthday!

God blessed me with the best sister
in the entire galaxy!
Happy birthday, sissy!

I’ve always prayed for your happiness
and I always will.
Happy birthday, sister!

Your faith and kindness inspire me.
May your blessings continue to flow.
Happy birthday!

I thank the heavens every day
for making us sisters.
Happy birthday!

Sisters like you are one of God’s
greatest blessings.
Happy birthday!

I’m so blessed to have you
as my sister.
Happy birthday, sissy!

Happy birthday, sister.
May God’s blessings shower upon you
today and always.

I thank God every day
for making us siblings.
Happy birthday, my forever confidante.

You are one of the biggest blessings
in my life and always will be.

Your love is one of my greatest gifts.
May God continue to bless you.
Happy birthday!

Praying that all your heart’s desires
come true.
Happy birthday, sis.

God shows me pure love
through you.
Happy birthday, sissy!

Let God guide your path
and bless your journey.
Happy birthday, sister.

I pray you’re blessed today
and always.
Happy birthday!

Praying that God continues
to cover and bless you.
Happy birthday, sis.

Being your sister is the biggest blessing
of my life.
Happy personal New Year!

I thank God for choosing you
as my sister.
Happy birthday, sissy!