Mass Delete Members below Orphan

"if there is any data in the application for any of these ORPHAN members the delete fails"

That is by design; you cannot delete members that contain data.  If you want to delete these members you need to clear the data from them first.

-DB

Cleared the data now to delete these members

Was trying to get the parent member ID for one of the orphan members ID and then wanted to delete all the members below that parent member ID. But somehow the below output returns blank, looks like ORPHAN members doesn't have any parent ID even though they are grouped in one place in the hierarchy 

Is there a way to identify the ORPHAN members?

Dim objDimPk As DimPk = BRApi.Finance.Dim.GetDimPk(si, "Location")
Dim objDimDisplayOptions As New DimDisplayOptions()
Dim objList As List(Of Member) = BRApi.Finance.Members.GetParents(si, objDimPk, objID, False, objDimDisplayOptions)
brapi.ErrorLog.LogMessage(si, objList(0).tostring)

I currently done have any data for the members under the Orphan member. How do I mass delete those in one shot? Seems like a no brainer but the functionality doesn't exist in app...?

is there a business rule to generate a list of Account members in the Orphan folder?