Avengers Endgame Theory
I predicted the events of Infinity War with accuracy on Tumblr (starts with Loki dying, snap fails to be averted, Peter dies in Tony's arms) so I'm putting out my theory for Endgame just in case, as I haven't seen anyone else put this forward.
As theorised by others, surviving Avengers resolve to change the timeline to bring back the trillions of dead. The problem is that this destroys their own timeline where Tony and Pepper have had a child (I think she was already pregnant in Infinity War). Tony involves himself in the plan but without the knowledge of the other Avengers (except maybe Scott) successfully sneaks his young son to the surviving timeline to avoid annihilation. This, now orphaned child, goes on to be raised by Ben and May Parker...











