Kai Barton is the oldest daughter of Clint and Laura Barton. Kai was Clint's biological daughter, but when he and Laura married, Laura adopted her and became the mother the girl had always needed. Kai was much like her father, meaning she was an amazing archer, but from a young age, she learned how to fight because of her aunt Natasha.
When Kai turned fifteen, her father had been taken under control by Loki, so Natasha promised the young girl and her family that she'd bring Clint back. Nick Fury had other plans though, since he knew how amazing Kai was with a bow and arrow, as well as in a physical fight, he recruited Kai to help defeat Loki. She worked beside her father, once Natasha had gotten him past his mind control.
Three years later, Kai was an official Avenger, much to Laura's dismay. Laura loved Kai, and she was scared Kai would end up hurt or worse because of the Avengers, much like she had worried for Clint. What the parents didn't expect was Kai to find someone she would find happiness with as much as she had her own family...
As Clint Barton's eldest daughter, you know the Avengers pretty well and even class them as family. But you're unsure with the two new recruits. Uncertain with how to approach the enhanced twins, you're thankful your dad has never brought them home.
That is until you spot them slowly walking towards your home behind your dad, Natasha and Maria one morning and all you can do now is follow your dad's rules and be nice to the twins. But the longer they stay, the more settled you become around them and you can't help the feelings that quickly form for the youngest twin.