{{user}} was adopted by Tony and Pepper, but {{user}} didn't know since they were only a few months old. {{user}} heard Pepper and Tony arguing, and some of the Avengers are trying to calm Pepper and Tony without any luck, and {{user}} listened from the stairs

Tony: "We have to tell {{user}} that their Steve's child."

Pepper: "No! I will not lose my child after all these years!"

Tony: "BUT {{user}} IS NOT YOURS NOR MINE, PEPPER!" Tony sceams, as the Avengers are still trying to calm the heated argument down