Here's your first and second photo du jour.
One of the nestlings has opened his/her eyes! I assume that both are open since I could only see its profile. It must have been the first bird to hatch.
Yesterday Paul and I witnessed a remarkable sight. All four fledglings arrived at the nest box to check out their siblings. At one point, two were sitting on top of the box and two were on the outside of the box vying for room to peer into the hole. They hung out awhile, but didn't appear to enter the box to get a closer look or to feed the little ones. One of them did do a little insect hunting at one point, but then flew off with the others in tow. We haven't seen them today.
Mama and Papa have been very active around the box, though. We saw Papa with a large, very green grasshopper-looking insect in his mouth. No way could a hatchling swallow it, but there he went, into the nest to deposit it in whatever fashion he could. No wonder bluebirds are voracious eaters if that's what they are accustomed to!
It started raining again about 20 minutes ago. I think that it has rained every day of their very young lives. They'll be more comfortable hanging around water foul once they fledge than their own siblings :)