How to find grout tube from Hosted wall

DesignScript
,
12

Hello
an solution with Python

Screenshot_select_child host

import sys
import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *

clr.AddReference('RevitAPI')
import Autodesk
from Autodesk.Revit.DB import *

clr.AddReference('RevitServices')
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

#Get Important vars
doc = DocumentManager.Instance.CurrentDBDocument
uiapp = DocumentManager.Instance.CurrentUIApplication
uidoc = uiapp.ActiveUIDocument
app = uiapp.Application

element = UnwrapElement(IN[0])

fec = FilteredElementCollector(doc).OfClass(FamilyInstance).WhereElementIsNotElementType().ToElements()
fec = [x for x in fec if x.Host is not None]
OUT = [x for x in fec if x.Host.Id == element.Id]
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