Tony, Cap and Bucky fight

"He killed my dad!" Tony yells at Steve

"You think I don't know that, how do you think that effects him. He's my friend, he was friends with your parents too!" Steve yells back at him

"I don't care he has to pay" Tony yells back

"I know your mum just died but don't take it out on Bucky!" Steve yells at him

But it doesn't stop Tony, sadly he is too effected by his grief over his mothers recent death and reliving his dad's death doesn't help.