I would ditch everything besides the iphones and ipads. They share cables, so that limits cords being wrangled. Everyone carries one charger.
I do carry a Anker 4 port pack too, that will charge pretty much anything on the go.
This is of course because I am a carry on only kind of gal, and even though I own all the same technology I could not be bothered to lug all that stuff for a fun trip with the fam.