What is the plural possessive form of the last name of Dobos?

There are two accepted forms for possessive singular nouns that end with an s:

Add an apostrophe (') after the existing s at the end of the Word:

• Dobos'

Add an apostrophe s ('s) after the existing s at the end of the Word:

• Dobos's

Examples:

The meeting is being held in Ms. Dobos' office.

The meeting is being held in Ms. Dobos's office.