Today, I arrived in the park to see both parents soaring above the park and perching together on the west side of the park. I looked for the fledglings on that side of the park, but couldn't find them so I returned to the east side of the building.
After about twenty minutes, Rosie (the adult female) appeared and brought a bird to one of the fledglings. We watched Rosie help the fledgling eat, which was unexpected at this date.
After the meal, the other fledgling appeared on the same, high south side Silver railing. They stayed together like bookend at opposite sides of the railing.