The reason one would specify having a red apple is because it could be a color other than red (other people may have green apples, or brown apples if they're rotten, or whatever). A wife may similarly be other than beautiful (other people may have non-beautiful wives, or ugly wives, or whatever), and children may similarly be other than wonderful (other people may have non-wonderful children, or rotten children, or whatever). Adding the adjectives thus adds the same sort of value that adding the adjective red to apple does. Clearly when someone adds an adjective in this sense they are merely giving you more information than otherwise, for whatever reason. For beautiful wives and wonderful children there is likely pride, status, or whatever that they wish to convey alongside the mere existence of such entities. The existence of similar entities to which the given adjectives may not apply can give value to using the given adjectives.