100 Cute Sister Instagram Captions That Show You're Basically Best Friends (2024)

Sisters are special. You love them beyond words — they're the built-in-bestie you can't imagine life without. But things between sisters can get a little crazy. One minute, things are cool, and you're posing for the most adorable selfies, and the next minute you're going to war with each other because she borrowed a special shirt of yours without permission. Regardless of how much you tease, argue and fight, there's no denying the special place that sisters have, which is why you're constantly sharing your times together, past and present, on IG. Whether you're snapping selfies of you hanging out at home, or posting a carousel of embarrassing baby pics for her birthday, you often find yourself needing the perfect Instagram caption to convey just how much your sister means to you.

It doesn't matter if she's your biological sister, or your chosen family, like Hunter Schafer and Zendaya, you can shower your sibling with love and affection, or troll them with the perfect Instagram captions, which is why sister selfies are so much fun. When it comes to sister Instagram captions, there are so many different types to choose from. You can keep things fun with inside jokes, compare yourselves to famous sister duos or find inspiring quotes from celebrities to let the world know just how you feel about your sister. We've compiled a list of cute sister Instagram captions that will have your sis posting heart eye and crying emojis in your comments.

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."
• "Siblings by birth, friends by choice."
• "A little sister is a forever friend."
• "Sisters are magic."
• "Little bit of childhood that can never be lost."

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."
• "You can fool anyone, but never your little sis."
• "What do you mean by no pets allowed? This is my sister."
• "Sibling sandwich!"
• "My sister > Your sister."
• "My sister has an awesome sister. True story!"
• "In the cookies of life, sisters are the chocolate chips."
• "It's almost scary how well we know each other."
• "Ain't no haters coming between us."
• "Partners in crime."
• "Double trouble."

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."
• "Happy birthday to my gorgeous sister.”
• "Birthday cakes are always good. But a sister with a birthday cake? Even better!"
• "Sister, you are not old. You are vintage."

One Word Captions

• "Sisterly 🥰"
• "Roomies"
• "Inseparable"
• "Queen"
• "Besties"
• "Favorites"
• "Cuties"
• "Goals"
• "Girlies"
• "Happy"
• "Lucky"
• "Together"
• "Family"
• "Seester"
• "Cheerleader"
• "Secretkeeper"
• "Champion"

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
• “Sisters are friends we have for a lifetime.”—Catherine Pulsifer
• “You’re not my best friend. You’re my sister, and that’s more.”—Jenny Han
• “Sisters make the best friends in the world.”—Marilyn Monroe
• “Sisters will always love you tomorrow no matter what you do today.”—Marinela Reka
• “Sisters become more beautiful as each day passes by.”—Michelle Malm