Assuming grandparents are local or unemployed and willing to move. And willing to do the work (maybe including food?)

Labor aside, a 2 bedroom in Mountain View is quite expensive and doesn't come with learning materials, toys, classmates, etc.

This feels like a good average globally, right? You have multiple staff per room (hopefully!) + admin staff + cook who need to pay their own rent+spending, then add the costs+mintenance of the daycare itself. Unless government-subsidised, I'd expect the daycare costs to be in the same ballpark as the local rent.