3 of 4 of the babies have fledged. However, the one female fledged too soon and she did not make a safe landing. RIP Unita.
Females are much larger than males so they usually are the last to fledge. I guess she saw her brothers do it and wanted to do it too. The first fledge was actually an accident. The professionals took him back to the roof, since they need to jump off things and cannot gain altitude from the ground.
There is still one male (we are thinking he was the last egg to hatch) still hanging around the nestbox. I'm sure he'll also take flight soon.