Here is the female feeding the baby birds.
If you look carefully, you can see a nestling looking through the opening in the bird box.
This morning I watched the male bird seemingly try to coax the fledglings from the box. He called, flew to the box, flew back to the tree, called again. A couple of times he went inside the box. I had other things to do and couldn't just watch all morning, so I went on about my chores. This evening, I could hear the bluebird calling in the edge of the wooded area nearby. Maybe the birds finally left the nest today. I will look tomorrow to see if there is any activity at the box.
I've enjoyed watching them raising their brood.