Which of the following is NOT a type of family in Revit?

In Revit, families are categorized into different types based on how they are created and used in a project. The three primary types of families are System families, Loadable families, and In-place families.

System families are predefined in Revit and cannot be loaded or created from scratch. They include elements like walls, floors, roofs, and other similar components that are essential to architectural design. Loadable families are created externally in a separate family file and can be loaded into a project. They include components like furniture, fixtures, and other objects that can vary widely in design. In-place families are those that are created directly within a project environment for specific uses and cannot be reused easily outside of that specific project.

Nested families, which may cause some confusion, refer to families that are included within other families. They are a feature of Loadable families and can enhance the complexity and detail of a family but are not considered a separate type of family.

The key distinction is that Nested is not a standalone family type in Revit, which clarifies why it does not fit into the classification of families as the correct answer to the question.