And that’s assuming the two working adults are brown-bagging it at lunch every day and not eating out lunch with team members at least a couple times a week.
So $70/day gives you room to eat out as a family maybe once a week, not daily. (No way a family with a 2 and 4 year old are doing that, but that’s kinda besides the point)
Of course there are people who claim they eat like a king for $5/day. And I don’t doubt it’s possible, but I doubt it’s common for a middle class family of 4 living in the city who are probably paying Amazon to deliver their groceries.