I'd tell df. We'd immediately pay off our wedding, all outstanding debts and that of my parents, too.
Immediately put 30 mil into some sort of fund and make the money work for us.
Build a new house. Mum and Dad can have this one if they want.
Go to America. Df wants to go to drag week so I'd do that, and I would HAVE to take the kids to Disneyland, Harry Potter World, Universal Studios etc.
Df would buy cars. And sheds for the cars.
I would get a whole new wardrobe.
The kids would get trust accounts.
That's probably enough