Everyone on the Octopod minus the Captain and Inkling are siblings (like I've said before) and they obviously all act like siblings.
They all fight with each other from time to time, but they all love each other and would defend their "siblings" with their lives.
Kwazii and Tweak fight constantly and constantly like to let the other know how smelly and stupid they are, but if anyone else were to say even one bad word to their "brother"/"sister" then they'll likely have their skin flipped inside out by a very irate bunny or cat trying to protect one of the people they love most in the world.
Dashi and Peso sometimes like to have a night together where they watch TV while cuddling in the Game Pod and letting their younger siblings go do whatever. This has always horribly backfired in the past.
Everyone fights over the remote every single day of their lives. It's almost impossible to agree on a single TV show/movie everyone likes, the last time two people wanted to watch TV (Kwazii and Tweak) it took them an hour to decided what to watch, and who'd watch their show first.
The Vegimals are babies, and everyone will always do everything that they can for them from running them a bubble bath and playing in the tub with them to pouring them hot cocoa in sippy cups and letting them sit in their laps while they drink it all.
Sometimes if one of the kids or Peso are sick, Kwazii has been known to sit outside their room for hours and asking their guardians or the Captain if his "little matey" is alright.
If one of his baby siblings are sad in any way, Kwazii will try to make them smile again to the best of his abilities from doing silly dances and telling pirate jokes to letting them lay their head in his lap while they tell him about their bad day and he plays with their hair.
All the Octo-siblings have embarrassing stories and pictures about each other that they will use without blinking. These photos have been shown to family, friends, random people in the street, basically anyone on Earth who'd like to see a picture of Tweak after she's just woken up.
The kids are each other's siblings and along with Octo-Adoption comes all the normal sibling stuff like fighting over toys and tormenting each other when they're bored.
But all the kids love each other to the moon and back, and will take any chance they get to spend time with their "siblings" whether they're pranking Inkling, singing Hamilton with each other, or giving one of their "siblings" a group hug cos they were sad
The kids can be nice to each other for a certain amount of time like when Koshi reads all her little siblings "Donna Doxi" stories while they snuggle up to her.

YOU ARE READING
The Logbook Pt. 2
FanfictionThis is part 2 of the Logbook. If you are new, you DON'T have to read pt. 1