The one in the middle hatched two weeks ago. The one on the left hatched one week ago, and the little fluff ball on the right hatched two days ago. You can see the third chick moving at 6:20 in the video. Prior to that, chick #2 was sitting on him/her.
Number three has dropped back down into the nest.
This was the egg on June 27. It was gone on June 28.