True if the family supports editing, false otherwise. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
Remarks
 The family will not be editable if it is in-place, not saveable, or represents the primary family inside a family document.