Family of 4 currently spend ~$55-60k annually but that includes $30k in mortgage payments. I'd pay off the house with ~$500k of the 2.4 million (including taxes).
The rest would still be invested, mostly in VTI/VTSAX, with some diversification. I would expect 6-10% on average adjusted for inflation.
My house would be paid off so we would be down to $30 ($40k tops) in annual spend, which the ~$2 million would generate double or more of that spend annually.