Update

I just went outdoors to the gazebo and found that the babies are all out of the nest.  So's the mom.  It could be that she moved them since the nest had become so popular.  They were pretty big already, though.  They have skinny rat tails instead of nice, bushy tails.  Their mom wasn't much larger than they were.  I hope they can survive.  We have a neighbor cat who would love to torment them.  Radar likes to think he will catch a squirrel, too.