I knew there was another batch of babies in the birdhouse because I could hear them crying all the time. Look at those wide opened mouths.
These poor parent birds are constantly feeding at least 2 baby birds. It is a cycle that starts at daylight until dusk. They fly back and forth all day long I have no idea when they have time to eat.
I do not know if this is same parents as before or if another set that moved in after they were gone. All sparrows look the same so it would be hard to tell.