TONY + Diego
Diego didn't know Tony very well. Or at all really. He knew who he was, though, because he'd seen Klaus talking to him. He wasn't very active on the network himself, but he kept up with his brother's activities.
"Tony, right?" Diego jutted his chin toward the man. "Diego," he offered. "Klaus is my brother." He didn't identify himself as 'Klaus' brother' because in his mind that made Klaus the superior one, and while Klaus was his favorite sibling if he had to choose, he didn't want to give him that kind of status, even in his own mind.