An interface class which provide the callback for family load options. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Remarks
If the family is not loaded, or if the family is loaded but unchanged, the situation will never trigger and OnFamilyFound(Boolean, Boolean ) and OnSharedFamilyFound(Family, Boolean, FamilySource , Boolean ) will not be called. Only if the family is loaded and changed should the interface methods be called.