I visited the nest site yesterday (19th of Jan) and was there from shortly afrter 3:00 PM until 5:00 PM.
A single parent was on the nest the entire time I was there and the second parent flew in and stayed only a minute or two before flying out. I observed a parent feeding a single chick a number of times, and took numerous photos.
It may just be my imagination, I hope so, but I couldn't help but think that what I was seeing on the left (East) side of the nest looked a lot like a single leg of a bird (I hope not an eaglet) infront of a mass of grey which could be a young bird body.
It did not change position over the 2 hours that I took pictures.