Congratulations! You done real good raising your kids! I know other families like yours, where the kids are trained to be entrepreneurs, and they do well. Majority aren't, but kudos to the ones who are with the entrepreneurial spirit.
My kids are doing well, but are not millionaires. They work for others in companies. One just quit a highly paid manager position (making close to $200K) to concentrate on starting a business with her husband. I had some concerns when she was a teen not listening to my advice over that of her friends. Me and my wife became well off by being conservative, and it finally sunk in for my kids to be conservatives when they went to work. Millennials who aren't taught that they can be successful, have a rough road ahead. Congrats again.
There is the key. Or even worse they are thaught that they can NOT be successful without the government.
Best wishes to your kids as well.