The correct way to make the plural of "Phillips" when referring to a family is simply "the Phillips family".
Here's why:
* Proper nouns: "Phillips" is a proper noun, a name of a specific family.
* Pluralization: We don't typically make proper nouns plural by adding an "s."
* Family unit: We use "family" to describe the group of people as a whole.
Examples:
* "The Phillips family gathered for a reunion."
* "We spent the weekend with the Phillips family."