To my delight, the kids are happy about participating in cat-care, so far. Katrina even poop-scooped voluntarily! I showed her how to give the kitties some wet food (a small amount as a treat only), and she took this job very seriously.
Meow-stache (the mommy) was certainly more comfortable back in the safety of the one room they've gotten to know. I notice she's fine with just me, but acts nervous when there are kids around, or too many kids. Katrina especially seems to scare Meow-stache, even though Katrina is really very gentle and careful with her. I have no doubt they'll adjust quickly to each other though.
Zorro on the other hand will be "the kids'" kitty, as he's much braver and likes to play more.