I got lucky on Monday. When I arrived at Governors Island, the Red-tailed Parents and a fledgling flew back and forth from the weathervane to the communications tower for about 45 minutes. It looks like in early August the fledgling is being a pest. It's time he/she starts to learn to hunt and he/she was looking for handouts. How this develops over the next few weeks will be fun to watch.
After all of the action was over, I did catch up with one of the adults who was harvesting branches. I think it was the male. It looks like he's adding twigs to a different spot on the communications tower.