Back Before the Start of Us (on hold)

During one of Tony's parties, the children of the Avengers slip out to get away from what they deem the 'boring' festivities.

However; due to a dumb decision to leave the door unlocked, the kids get into Tony and Bruce's lab.
The press of the wrong button and the pull of the wrong lever sends the kids hurtling back in time, years before they were born.

Thankfully, they can just ask Tony and Bruce to help send them back home right?

But meeting the younger versions of their parents isn't as fun as they thought and while struggling to get anyone to believe them, the kids start to realise why their parents didn't tell them many stories from the past.

All they want is to go home. But is it really that simple?