Actually it did include the family suites - but not the Little Mermaid rooms. Little Mermaid was included in free dining for a limited time right after it opened last September, but it hasn't been since then.
Little Mermaid has been excepted from most if not all discounts that have been offered this year, so I wouldn't look for any free dining there. But if it is offered, it may be offered for the family suites.