Peter's connection to Tony is pretty obvious. As a scientist Tony and the Stark family would be idols to Peter. I'm guessing that by the end of this battle, Peter will have it engraved in his head that he works alone and doesn't want any part of this.
I'm guessing the end of this for him, will be him choosing no sides, not switching to Cap's. Both Steve and Tony have fought and killed others.
I will bet anyone here that Spider-man's presence here is not to take sides, but to show both Tony and Steve, they are both right, and they are both wrong, and by the actions that they have taken they have brought about even more collateral damage.
