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Isabel is all the way to the left, and Ronan should be easy to find for devotees of his website!!
Colleen is the chief, she's the palest grownup. Chris (afternoons) is the blonde, and Pam (mornings) is the tannest.

For future reference I'm going to attempt all the names: (*** = new kid, will fill in when I learn the names)
top row: Willie Zuvic, Will, ***
middle row: Isabel Murray, Giselle, ***, CJ, Thomas, ***, Becky, Ronan Wood-Gallagher
bottom row: Alice, Lilly