In particular, I see no moral right to inheritance. It might be practical, It might be worthwhile, for any number of reasons. It might be nice! But I don't see what Bradbury's kids did to gain a moral right to his royalties, any more than I think Elmo had a moral right to an emerald mine.

“… Elmo had a moral right to an emerald mine.” I missed that episode of Sesame Street.