None of them really knew how they ended up there.
Although the general agreement was that there was the past, plopped right in their childhood rooms bags packed and ready. Which sucked in many ways, big and small, ranging from 'my favourite pastry store isn't open' to 'dad's alive' to 'Wars' to 'my lover doesn't know me ;(' and even 'The whole village thinks I'm still a mass murdering psycho' among others. All deplorable and terrible things indeed, especially the first one.
And then the 'Dad's Alive' one hit them flat in the face when they got called to the office as a last debrief before they left. When they realised this fact they simultaneously agreed to channel as much of their Inner Kakashi™ as possible in revenge of buckets of childhood trauma and their little brothers everything. Therefore when they were standing before the Kage at the end of the debrief and he states "Well I'm sure you understand your roles in this mission and will perform them accordingly for the sake of our nation" this was a dismissal, they all knew it but instead of nodding and leaving like normal they each channelled their spouse's each reply more disturbing than the next.
Kankuro first whining that "But killing Pack wouldn't make a good first impression" with one of his prototype hound puppets by his side. Weird not too weird though. Puppet Masters where know for that, much like Jonin and Prodigies therefore it was brushed off.
But then came Temari's reply a bored drawn out drawl stating "Seriously, What a drag" with one of her arms reaching to the back of her head. Which no, that was not Temari, Temari unless under duress of Gaara always had this cocky confidence that wasn't cockiness because she could dish out her talk in a fight and never once in her life has she uttered the words 'What a drag'.
About to send them to T&I to make sure there was no outside interference, this mission was important after all. Then Gaara happened.
Gaara In All Of His Youthfulness put up a Nice Guy™ pose and stated with no lack of cheer and a smile on his face "It Would Be Most Unyouthful Indeed!". The rainbows flew behind him with petals in the air.
Throughout the room they could hear whimpers coming from the most elite and dangerous shinobi of the village along with distraught mutters of Kai echoing the room mixing in with the almost inaudible sobs. The siblings seemingly the only ones unaffected by whatever this was (It was from years of putting up with Naruto, Lee and Gai's bullshit, they'd just become apathetic to it).
As the Kage moved his own hand into the seal his kids heads whipped around to stare at him, like a dessert fox spotting it's next meal in the sand.
And in union they stated together each in their own pre-formed stances with no infliction in their tones "But Father I love him" Before shuishining away to the front gate. Nothing but twitches of their lips to betray their amusement.
Let's just say that if Orochimaru didn't skin-steal his body their would have been lots of questions by the last stage of the exams. They already had enough looks from Baki for it. Although thinking back on their Fathers shaken and disgruntled face as he tried to dispel a jutsu that hadn't been cast made all the odd looks and attempts at interrogation worth it, and the fact that they each got to see their not yet other half too but, semantics.