20 great Halloween costume ideas for siblings

Halloween’s around the corner, and let’s face it, one cute costume is great, but two (or more)? That’s double-tap worthy. Welcome to the ultimate guide for sibling Halloween costumes! These aren’t just outfits; they’re memories in the making. Whether your kids are into video games or story book characters, we’ve got ideas that will make your Halloween Insta-famous. (Get ready for cuteness overload.)

How to choose a sibling Halloween costume

Picking the perfect sibling costumes isn’t just about what’s trending or what looks adorable—though let’s be real, that’s a big part of it. The secret sauce? It’s all about the kids’ personalities. Do they have a shared obsession with a cartoon series? Bingo! Are they polar opposites like night and day? Even better—think sun and moon costumes. The key is to find a theme that lets each child shine while still forming a unified, picture-perfect ensemble.

We’ve rounded up a collection of Halloween costumes for brothers and Halloween costumes for sisters which can, in many cases, be expanded on for larger crews! (Family Halloween costumes included!) So grab your little monsters, fire up the Pinterest board, and let’s get this Halloween costume party started.

Mario and Luigi

Allegedly Mario and Luigi are twins, but this dynamic duo is a great option for any sibling set!

Hot Dog and Ketchup

I mean, you really can’t have one without the other. We found a non-itchy hot dog option at Target this year and a tot-sized authentic Heinz packet here.

Harley Quinn and The Joker

There are lots of great villainous pairs to choose from, but between the face paint and colorful hair styles, Harley Quinn and Joker are always a lot of fun to execute.

Pirates

Aargh! They’re bound to collect plenty of booty as a pair of pirates! There’s so many ways to pull this one off, from DIY to the machine-washable styles from Little Adventures which come in dress and pants versions.

Ice Cream Scooper and Ice Cream

What a sweet pair! We love that this one can be interpreted in a variety of ways, from an ice cream dress to a more realistic ensemble. And how cute is that scooper?!

Real Life Hero Squad

From fire fighters and police to army soldiers career-themed costumes are great for Halloween and role play all year round.

Tooth and Toothbrush

If you’ve got a toddler with opinions and a baby who has no choice but to go along for the ride, hilarity is bound to ensue. A tooth and toothbrush are also semi-easy to whip up with felt and pool noodles. Win win!

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Rock, Paper, Scissors

Get major creativity points for this clever group costume. Of course you can make a lot of it from poster board, but if craftiness isn’t your forte, don’t worry. We’ve got you.

A Very Hungry Caterpillar and Butterfly

The Eric Carle classic offers a perfect before and after costume pair! The super cute caterpillar is a cozy get up for little ones and the beautiful butterfly makes a fun DIY project.

The Grinch and Cindy Lou Who

A mean one never looked so cute! The Grinch and Cindy Lou Who is the perfect option to get excited for the holiday season ahead.

Cinderella and Prince Charming

These adorable Cinderella and Prince Charming costumes are stretchy, comfortable and machine-washable. After all, dress up isn’t just for Halloween!

Wednesday and Pugsley Addams

Is there a better set of siblings to pay homage to on Halloween than Wednesday and Pugsley? We think not. (We also love this adorable set from Etsy that’s perfect for little ones!)

The Sanderson Sisters

They are sisters, after all! Sarah, Winifred and Mary Sanderson are a classic choice at this point. (We also love this option which each come with matching wigs!)

Wayne and Garth

Party on with this absolutely unstoppable choice. You can totally DIY Wayne and Garth with a few key accessories.

The Queen and her Corgi

If you’re working with siblings of the furry variety, may we suggest this royal pairing? (It’s the wig that really does it for us.)

Cruella and her Pups

Luckily you don’t need 101 kids to pull this one off. But with tons of different ways to style Cruella and her spotted pups, there may be 101 ways to do it.

Pebbles and Bam Bam

Got a tiny Bam Bam or Pebbles on your hands? Try this prehistoric pair!

Lion pals

Warm, adorable and I mean, a group of lions is fittingly called a pride, right? What’s better than that?

Ghostbusters and the Stay Puft Marshmallow Man

A pack of Ghostbusters is a great sibling option, and a stellar choice for a family Halloween costume as well!

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