Only three kin, including the grandson. They get a decent pile of cash, taxes considered, some property, a trust for the kid's education and, if they tear through that, I'd expect them to kick and scratch as I did. I like to think they are smart enough and tough enough. Time will tell. Hopefully they will invest wisely and still have enough for some frittering.
I do not want them to get lazy or slovenly. They get enough to live well for a bit but, if they handle it wisely from the git go... they can live quite well for life. My death will be my last teaching moment. Their choice.