First thing, get a good tax planner! Don't want HMRC grabbing 40 per cent of it when I go. Set up the two children and the grand children with a suitable trust. Get a better house.
Most of the things that people think of, or dream of, are either very cheap in the context or far more expensive to keep than they think. The most expensive car is cheap, as are most good houses, but any yacht in the South of France bigger than 70 foot (which is no size) costs a fortune to maintain, and a decent racehorse is only for very serious money (quite a lot to buy anyway, but the training and other outgoings are enormous). And a private jet? Even billionaires often share one.
The very rich that I know have none of the features that the tabloids make news; they're not spending millions on birthday parties. They live unshowy, quite modest lives. The attitude is that money is like water; you don't need to have a reservoir to be content but it's good to know there's always enough on tap for whatever you want or need. But they are so adjusted to wealth that they do say extraordinary things sometimes. One said 'I am having trouble with my bank'. I said 'Join the club!' Later, I asked him about his trouble with the bank and he said 'Oh, I sold it' Casual, or what?