Lazy rich child B's dad wrote some music, which he and his children can benefit from for marginal costs (publishing, taxes).
I know - in one case it is a physical object, and in the other - immaterial. But both houses and music can offer enjoyment and can be benefited from financially, and thus have inherent value.
I am not sure if the notion of private property should depend on the continued existence of the original creator. When do we start requisitioning houses for the hommage of the original owner?