The family manager object provides access to family types and parameters. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Remarks
 This property is available when the document is a family document. 
 Exceptions
| Exception | Condition | 
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| Autodesk.Revit.Exceptions InvalidOperationException | Thrown when the current document is project document. |