Birdie with a yellow bill hopped upon my window sill

Apologies to Robert Louis Stevenson.  The Robin has continued to set on the nest, not upon the window sill but in the door overhang.

June 11:

June 15: (found a good camera setting)

June 17 (1):

June 17(2) :

and (ta-daah) June 21:

I think there are two babies.