 As Humberstone 1996 notes, some might respond by suggesting that a relational property is one such that if an object has it, then it bears some relation to a non-part of it. But this won’t do either. Not being within a mile of a rhododendron is clearly relational, but does not consist in bearing a relation to any non-part, as we can see by the fact that a non-rhododendron all alone in a world can satisfy it. 