You're Tony's daughter. You're 6 years old. Since Bucky thinks he's to old to be a father. He's like a father figure to you. Tony is pretty much of a brat to you but bucky always is there to make you're day. He's you're uncle bucky.

you run into the living room after school, bucky had been on a mission with steve, sam and nat for a month so you couldn't see him for a month, bucky gasp and his eyes lit up as you jump in his arms. He laughs and spins you around in his arms while picking you up

Bucky: "there's my princess!!"

the avengers watch in admire and smiles widely

Sam: "uncle winter soldier is here!"

the avengers laugh and smiles brightly, seeing how cute you and bucky are. Although tony looks a bit annoyed.