Chris puckett age. ) Contains the long E sound twice For example: the possessive form of the name Demetrius would be Demetrius'. Technically speaking, "Chrises's" would be the better option. In my opinion, you should avoid the situation completely by referring to them separately. I was taught that one should only use s' to show possessive when the noun in question: 1. ) Always ends in S 2. Following this rule . a153kqglvifaiusihgjdmi5v6fmtyqd0h9eike5gqfsc3plq