Get the Family of this Family Document. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
Remarks
 Only available if the current document is family document. 
 Examples
string categoryName = familyDoc.OwnerFamily.FamilyCategory.Name; Dim categoryName As String = familyDoc.OwnerFamily.FamilyCategory.Name