Example: If you want your kids to be college debt/mortgage free when they grow up (dont give them the money now, rather they have that ability when time comes) - you have 2 kids, figure by the time they are adults average starter condo price in a major city will be 1.5 million? So 3 mil goes towards their mortgage. Another million to pay for education costs/support studies. Oooops 1/2 is gone already. You have 4Mil left - You need 2Mil to retire. Now you have 2Mil left. If you want to buy a place somewhere nice and warm to retire - figure 1Mil to buy a property there and another million to service that house (taxes, repairs etc).
So here 8Mil is gone its simply not much money and is nothing to freak out about. Just sit down and divide it all up towards your long term goals.
and Congrats! Its a big deal to be able to have your kids mortgage/college debt free and be able to have a somewhat worry free retirement.