During the second brood the male and female were killed by a hawk when the nestlings were 12 days old. The next morning another pair showed up looking for a nest box. They kept the box clean but would only feed them mealworms from my feeder after they had their fill. From my cam I saw that 2 chicks fledged, then one more on day 16 and the last one early morning on day 17.
The male is still attacking my windows and I have cleaned out the box for them to use.