The adventure continues!  The mom brought small twigs and white fluffy material to her nest today.  Also she found some red stuff that we couldn’t recognize.  She likes to stop near her bird house and always looks around before going in.  When she sees me, a “human,” watching she waits until I look away before quickly flying into the birdhouse.

UPDATE:  It took about a week for them to complete their nest.  Then it was quiet for a couple of weeks while the parent incubated her eggs and the other parent stood guard.  Then the feedings began.