Steve
Sam Wilson- Cousin

Tony
Natasha Ramonoff- sister

Thor
Phil Coulson- uncle

Bruce
Eric Selvig-uncle

Clint
Maria Hill-sister

Pietro
Tony Stark- mum's boyfriend

Sam
Steve Rodgers- great great great uncle

Loki
James Rhodes- brother

James
Nick Fury- Father Figure

Bucky
Clint Barton- brother

Vision
Helen Cho- cousin

Yeah, another one done (that one was super easy). This one isn't who you're actually related to, but if you were related to one of them, this is who you'd be related to. Does it deserve a comment or a vote? If not, please tell me what I can do to make it better!  :) Have a nice day.