First - the answer is 'no' I am not in the situation! But, i have some (limited) knowledge of this.
While you still have some influence (and control), think about how/what you teach your children about money - earning, saving, spending, giving. Think about how to teach them to handle the impulse to spend, rather than waiting a bit to see if the item is something you really need/want. When money is no object, it is very easy to spend without thinking.
Am in America currently, and there are (as you might expect), seminars and programs designed specifically for the children of 'high net worth' individuals. These purport to teach/prepare the children for the time when a significant amount of money will be theirs.
There are basics about money in general : finance courses, accountancy etc , along with basics like how to read a balance sheet, etc. Then there are lessons in personal planning: options for investing/managing the money, how to work with a financial planner/accountant, how to budget, pension/retirement planning, different sorts of mortgages, etc.
If you google 'prepare your children to handle an inheritance' (and similar phrases), you'll find a wealth of information that will help you begin to explore options.
Lastly, there are ways to provide a regular income stream from the money, rather than it coming in a big lump sum. There are also ways to protect the money from 'creditors, predators and themselves'. I'd look into those options - for instance, what happens if they invest in a dodgy business/business that goes bankrupt, what if they marry and divorce, etc. But, all this could be tricky as they may not wish to have the money 'tied up' where they can't get to it. And, we all know that a person's priorities and life experience at 50 is very different to that of a person of 25.
You've got alot of thinking to do! Good luck