The possessive form of the plural noun Reyeses is Reyeses'.
Example: The Reyeses dog is a border collie. (the dog of the Reyes family)
According to the Modern Language Association's current manual of usage, either "Reyeses's" or "Reyeses' " is acceptable if "Reyeses" is a singular proper noun, while if "Reyeses" is plural, the proper possessive is "Reyeses' ".
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