Need Help in DAX

[Anonymous]

Five Column Names = ParentID, ChildID, Column3, Column4, Column5
One ParentID can have multiple ChildIDs. 
Two or more  ParentIDs can have common Matching ChildIDs. 
I have created one slicer using ParentID column. I need a DAX to fetch only matching (intersecting) ChildIDs for selected ParentIDs (it could be multiple ParentIDs selection) in slicer

Note: We need to have ParentID slicer in the report. Solution should take into account multiple selections in slicer.

Scenario 1:

Scenario 2 :

[DOLEARY85]

sorry, also just make sure the selected measure filters the visual to only show value of 1

[DOLEARY85]

Hi,

i have something that might work:

Selected = var countselected = calculate(DISTINCTCOUNT('Table (5)'[ParentID]),ALLEXCEPT('Table (5)','Table (5)'[ParentID]))

var countchildid = calculate(count('Table (5)'[ChildID]))

Return

if (countchildid = countselected,1,0)