* The 3 kinds of families in Revit are: system families, loadable families, and in-place families.
* All of the elements that you add to your projects, whether they are walls, roofs, doors, structural members, mechanical equipment, or plumbing fixtures; or even annotation elements like symbols, tags, and gridlines are organized into families.
* System families form the basic building elements, such as walls, floors, roofs, ceilings, and other elements that you would assemble on a construction site.
* Loadable families are families used to create building components such as doors, windows, furniture, and plumbing fixtures.
