Which of the following sentences contains a capitalization error?The president and his family visited some historic sites.

The president and his family visited some historic sites.

The family of president Jones enjoyed a vacation.

The nation looks to the president for leadership.

The media interviews the president most days.

The sentence that contains a capitalization error is: "The family of president Jones enjoyed a vacation."

The title "president" should be capitalized when it comes directly before a name, so it should be "President Jones."