import clr
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *
clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager
import System
doc = DocumentManager.Instance.CurrentDBDocument
elementlist = []
FamilyType = UnwrapElement(IN[0])
BltInCat = System.Enum.ToObject(BuiltInCategory, FamilyType.Category.Id.IntegerValue)
SymbolCollector = FilteredElementCollector(doc)
SymbolCollector.OfCategory(BltInCat)
ftlist = list()
for item in SymbolCollector.ToElements():
if item.GetTypeId().IntegerValue == FamilyType.Id.IntegerValue:
ftlist.append(item)
elementlist.append(ftlist)
OUT = elementlist