60 Cute Sister Instagram Captions That Show You're Basically Best Friends

Sisters are amazing. It's a special type of bond that you have for life — a built-in best friend who always has your back and who you know, deep down, will always love you no matter how much you fight. If you're lucky enough to be part of a sister squad, you probably have tons of embarrassing (and cute) pics of each other to post on birthdays, National Sisters Day, and whenever you want to show your sis some love (or tease them mercilessly).

With a cute sister picture must come an even cuter caption. That’s why we’ve made a list of all the sister Instagram captions you’ll ever need.

Cute Sister Captions

"Out of anyone who could have been my sister, I'm so glad it was you."

"My first friend, my best friend."

"Happiness is being with my sister."

"When I say I won’t tell anyone, my sister doesn’t count."

"The next Charli and Dixie."

"All you need is love... and a sister."

"Bella and Gigi have nothing on us."

"One soul, two bodies."

"Love is beautiful, sisterhood is better."

"I hate you but I love you bc you’re basically me."

"Fairies are real...they are called sisters."

"Sisters like you are diamonds. They sparkle, and they truly are a girl's best friend."

"A loyal sister is worth a thousand friends."

"Little bit of childhood that can never be lost."

"We didn’t need words, because we've perfected our own secret language."

"Our bond remains forever strong."

"How do people make it through life without a sister?"

"She’s the Mary-Kate to my Ashley."

Funny Sister Captions

"I'll always love our daily trips to the fridge."

"And I'll love you 1000 times more tomorrow."

"BTBFF: Born together, best friends forever."

"In the cookies of life, sisters are the chocolate chips."

"We go together like peanut butter and jelly."

"Lesson learned from Parent Trap? Better together."

"We may forget the years, but we will remember the moments."

"Life was meant for adventures with your sister.

"When mom and dad don’t understand, a sister always will."

"FYI, she got half her clothes from my closet."

"If you don't like it, my sister made me wear it."

"Jeans almost as good as these genes."

"Sisters who slay together, stay together."

"Good friends come and go, but a sister and her wardrobe are for life. Can I borrow your black top?"

"My sister is always my partner when it comes to dressing up."

"Our relationship isn’t always perfect. But our outfits can be!"

"Fashions fade, sisterhood is eternal."

"Too glam to give a damn."

"Forget the rules. If she likes it, I wear it!"

"We could give up shopping, but we ain’t quitters."

"We work hard so we can shop hard."

"The only person who is allowed to get on my nerves and get away with it."

"Best friends? Nah, she’s my sister."

"I can’t remember if I’m the good sister or the evil one... "

"Having a sister is like having a double."

"We shared a room, you stole my toys and then my clothes. I wouldn't have it any other way."

"Annoying her is my favorite pastime."

"Good Times + Crazy sister = Great Memories."

Birthday Sister Captions

"You're my favorite sister but I'm the favorite overall."

"Maybe she's born with it. Maybe it's her sister."

"Trust me, you're not old. You're vintage."

"Sisters by chance, friends by choice."

"The only time in our lives when I’m second."

"You’re the greatest gift our parents ever gave me."

"It’s my sister's birthday! Hurt her and I will break your face."

"Happy birthday to a sister who has the world’s greatest sister. ;)"

"I’ve been the oldest child since before you were born."

Sister Quote Captions

"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." —Amy Li

"A sister can be seen as someone who is both ourselves and very much not ourselves—a special kind of double."—Toni Morrison

"Sisters function as safety nets in a chaotic world simply by being there for each other."—Carol Saline

"What are sisters for if not to point out the things the rest of the world is too polite to mention."―Claire Cook

"There is no place for secrets in sisterhood."—Erin Forbes

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