Be careful: You can burn through $8M post-tax quicker than you think. We have a annual household income of >$1M pretax, so I have some experience here.
I'm assuming you live in the bay area. The price of nice but not stunning houses in many desirable areas is around $4M. Assuming your life expectancy is another 50 years, that's at least $45K/yr in taxes, so at least $2.2M in lifetime property taxes. The median home in Palo Alto is now >$3.2M, and that figure includes small or decrepit teardowns listed for land value alone. You won't be able to afford (and it would be a mistake to buy) some of the larger or newer houses on the market for $8M+.
Private school for two children can approach $100K a year (Castilleja in Palo Alto is $44K/year). You didn't say how old your children are, but if you include preschool and college, that could be $2M. You might want to hire a nanny. That's $30/hr, or over $70K/yr with employer taxes, or $1.4M without a raise for 20 years.
That's $9.6M for just a house, schooling, and child care. That doesn't include food, household cleaners, insurance, clothing, landscaping, pool maintenance, cars, a second house, hobbies, gifts to children, travel, etc.
Sure, maybe your investments will do OK. But on the other hand they need to beat inflation. Castilleja isn't getting cheaper. Your property taxes will increase, slowly but steadily, every year for life, and then there are local bond measures for additional taxes.
So my advice is to live below your means. We've tried this ourselves. Also you might want to stay employed, at least one of you, to extend your runway. Finally look for something meaningful in life. Attend a local church service over Christmas. Spending money by itself won't do it.