The “password child” TikTok theory is here to crush your dreams of being your parents’ favorite… and, more importantly, ‘winning’ over your siblings.

The viral trend puts forward a compelling theory that will help you figure out who your parent’s favorite child is based on their online passwords.

Prepare to feel personally attacked and impressed at the same time.

The theory has been presented by influencer Alex Griswold and his wife Melissa, who describe themselves as “your favorite internet parents.”

Taking to his TikTok account, Griswold posted the video which has now been viewed over 1.5 million times.

In response to a user’s question asking, “Which one of you is the password child,” he explained the phenomenon to his viewers.

“Okay, so the password child is like when you’re trying to watch your parent’s Netflix, but it’s logged out.

“So then you ask ‘what’s the password’ and then they say your name or one of your sibling’s names, and then whose ever name that is, is the favorite child.”

Many people took to the comments to share their thoughts on the concept as well as their own experiences.

One person said: “I’m an only child and I’m not even the password child…”

“I’m an only child and I’m not even the password child…”

“My sister is the password child but I’m the one who they come to when they forget the password,” another mused.

And this person joked that “nothing hurts worse than getting replaced as password child by a dog.”

A fourth claimed, “I was the password child until my sibling was born.”

The video has since gone viral, with the phrase “I don’t have a favorite child,” racking up over 48.8 million related videos, most of which are about the ‘password child’. 

TikTokers like Jasmine Ngugen and Clemence VP made hilarious videos off the back of the trend, where they bragged about being the ‘password child.’

Meanwhile, others pointed out that they might not be one of their parents’ password children, but they are the others, for example – they’re their mpm’s but not their dad’s password.

The trend gained such virality that even Urban Dictionary picked up on the term.

According to the site, a ‘password child’ “is a slang term referring to the child whose name a parent uses as their online password, implying they’re the favorite child.”