One parent was just there to feed, that's how i saw them. It was doing a good job of feeding both, because it was sitting on the thin dark steel beam and could only feed the one that was closest, but then flew away for a second to land in between the chicks and feed the other one, which seems to have some feather condition on its neck.
Under the terrace roof of a cafe again. Hope they don't get hurt falling off that beam before they're ready, the feeding excitement looked really sketchy.