Well there's a couple of things that are a bit specific to my situation - I'm only open 4 days a week, so I have a few less clients to choose from than a full-time caregiver would.
I also can have up to 6 kids, but I've limited myself to 5 (I've only been doing this a few months and think I'll burn out if I dive in all fast a furious), so if I had the two of them 2 or more days a week, that would do money-wise, plus it would be nice to break up the days with part-time kids.
I'd get a commitment of number of days a week, just not the actual days. We don't do any outings that couldn't be finalized the morning of, or rescheduled.

At any rate, the parents weren't able to commit to any time, so it's not going to go through. Blessing in disguise perhaps !