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The sentence is incorrect. The correct version is: 'To the disappointment of the crowd, neither the president nor any of his aides was able to attend the ceremony.' 'Neither' takes the singular form of the verb, not the plural, if the subjects are singular. 'The president' is singular, and 'any of his aides' is singular. However, if at least one of the subjects is plural, so is the verb: 'Neither my parents nor my cousins were able to come to my party.' 'Neither my parents nor my cousin were able to come to my party.' But: 'Neither of my parents was able to come to my party.'
The possessive form of the singular noun president is president's.Example: A crowd of reporters met the president's limo.
According to Oxford Dictionary On-line the plural is breath. The reasoning being that breath can be used in the plural and the singular as it is an uncountable noun.
The plural possessive for president is presidents'.Examples: Two of the US presidents' names were Roosevelt.
The possessive form of the singular noun president is president's.Examples:A president's residence can vary in grandeur from country to country.The US President's residence is the White House in Washington, DC.