In the US, we tend to add both plural and possessive s for proper names, since otherwise you can't tell whether the word is plural or possessive in speech. If I mention the Grimms tales, someone might thing I am referring to the tales collected by a certain Grimms, as the Yeats poems in "The Wind Among the Reeds" are the poems written by a certain Yeats. "The" plus possessive apostrophe s indicates that "Grimms" is plural (without the "the" it could still be singular: Yeats's poems). "The" pluralizes by itself, as in French, where we speak of "les Thibauld." The pluralizing s merely confirms it, and the 's which follows makes the name possessive and not attributive. The old rule that you don't need an apostrophe-following s after an ancient name is loosely connected to this point: ancient names are treated as commanding universal recognition, and in that sense as being like common nouns, and not more obscure proper nouns.
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Disagree!