R.M.
Hi K.,
I am a Certified Professional Nanny, and I ALWAYS was paid when the family was on vacation. The policy was, if I was willing to work, I was paid for that week.
You are their employee, and as such, they must either provide you with proper notice if there will be a "forced" time off OR pay you for your time.
If their kids were in day care, the day care provider would expect the be paid that week to "hold" their kid's spot.
While I'm sure you love the kids, I doubt (based on experience), you'll work out a compensation package with the family. I think it's time to look for a new job.
When ever I was hired at a new position, I insisted on a contract that stated my vacation/days off and if I was not needed (ie Mom wanted the kids for the day), that I was paid as if I worked. My contract also stated I needed 4 weeks notice if I was to have "unpaid" time.
FYI- one of my Mom's was on materity leave, I rarely worked but was paid fully for all days.
It's a matter of respect and what's right.
Good Luck.
R. Magby