I can pretty much confirm now that Lucy's fourth hatchling didn't make it. I don't know what happened to it, but I do know that I haven't seen it since the day it was born. There is hardly any room left in the nest for the three of them, I can't imagine what it would have been like with four. It is business as usual with Lucy and Ricky; constantly foraging and feeding. The babies literally grow overnight, it is amazing.
I haven't seen much of Big Mama and Big Daddy. I did see them both foraging together for a brief time but that was it; no sign of Robbie and Roxy. I'm always looking for them though, I hope I get to see them at some point. Big Daddy still guards the nest, he ran another Robin out of his territory just like he used to when the babies were nesting. It's hard to believe that Mama is most likely laying eggs in another nest by now. I checked the empty nest today and the unhatched egg is still there. Looks like it got pushed into the very bottom of the nest.