A fulltime nanny (aka, daytime, approx 9-10 hours, not live in) is only going to run you about 25-35k in many areas of the country. (I'm speaking of a legal resident with a green card or US citizen).
I think you'll find buying a smaller home or going on fewer vacations or eating out much less and getting some domestic help will drastically improve the quality of your life.
I think you'll find buying a smaller home or going on fewer vacations or eating out much less and getting some domestic help will drastically improve the quality of your life.