Buy a house for my sister's and their kids, move my Folks to where they want to live too. Maybe buy one or two houses in desirable locations where I could take tests between adventures and have visitors.
After that I'd maybe buy a LandCruiser and do my round Australia trip I've been wanting to do for years. Follow that up by touring other places in the world. I don't want massive luxury, I want adventure.
While I was touring the world I'd invest the money so it just builds. About half the interest generated would be going to family, I think 10% would keep me happy and able to continue with chasing adventure. I'm afraid that I'd be very quiet about telling people about my win.
I'd basically love to distribute enough to my immediate family to ensure that they could pursue leisure if they wanted to or build wealth of their own if that was their preference. But I'd be very clear on the fact that the plan would be to give out on a yearly basis, if they blew it in a month,that's their problem not mine.