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There are two accepted forms for possessive singular nouns ending in s:

Add an apostrophe (') after the existing s at the end of the word: Matthew Kitsos'

Add an apostrophe s ('s) after the existing s at the end of the word: Matthew Kitsos's

Examples:

We met Matthew Kitsos' parents at the meeting.

We met Matthew Kitsos's parents at the meeting.

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11y ago

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