Remember when Sia dropped “Chandelier” and everyone lost their minds?

And remember when she released the music video and everyone lost itagainover the young dancer who starred in it?

Who are these mystery siblings?

Maddie Ziegler on a red carpet

What’s the story behind the Ziegler family?

Here’s the truth about Maddie Ziegler’s brothers you never knew about.

But Mackenzie and Maddie are not the only kids in their family.

The Ziegler/Gisoni kids

There are, in fact, six siblings in the Ziegler/Gisoni clan.

According toBustle, Maddie has two half-brothers from her father’s first marriage: Ryan Ziegler and Tyler Ziegler.

She also has two step-siblings from her stepfather’s first marriage: Michele Gisoni and Mathew Gisoni.

Tyler, Ryan Ziegler smiling at graduation

That’s three brothers!

They share the same dad, but Ryan is from their father’s first marriage.

And, if Twitter is to be believed, he’s putting that education to good use.

Tyler Ziegler with baby Elias

“I’m so blessed to be an uncle and I couldn’t be happier!”

the younger brother wrote.

“Welcome to the world Elias.”

Tyler Ziegler taking a selfie

thank you @dr_woo for the most perfect first tattoo."

Siblings that get tattooed together, stay together, right?

That caption simply reads: “Love.”

Maddie, Mackenzie, Tyler, Ryan Ziegler