as of 1345h - Nellie is the last chick in the nestbox - not surprising, as I recall, Nellie was the biggest of the three chicks here.
Went back through the recordings and all three chicks had lots of playtime on the nestledge yesterday (photo above) and at least one of them stayed on the nestledge overnight. This morning at 0523h Dixon took off from the nestledge leaving Cora on the ledge and Nellie in the box. Cora sort of followed Dixon a couple of hours later (0617h) when both she and Nellie were wingercising - they bumped wings and she took off. Nellie has continued to hang out, wingercize and nap without her siblings today. She doesn't seem too twitchy though ... might mean she can see her sibs but we can't with our cameras or from the ground. Or she isn't concerned about being by herself in the nestbox.