I don’t see my wife and I’s immediate families (grandmother, moms, dads, siblings, nieces, nephews, aunts, uncles, 1st cousins) giving us any grief about it. I suspect they’d be cool about it, as I suspect my close friends would be as well. Well, except for one cousin, who’s a pretty serious drug addict, and one of her children is something of a knucklehead. I could see either of them showing up and expecting me to fund them. (which wouldn’t happen)
However, there are legions of 2nd cousins and 3rd cousins who might come out of the woodwork- I don’t know many of them, and none of them well.
Like others have said, I suspect i’d be at most risk for acquaintances from schooling and work showing up figuring they have nothing to lose by asking me for handouts- either directly, or due to all manner of sob stories.
I’d try and avoid it by creating a trust, and having the trust claim the prize. Then it would be more of a matter of trying to keep a loose lid on spending (i.e. no gilded Escalade or selling my pickup and getting a Bugatti Veyron, or moving to some kind of mansion)