SubForm.Parent Property (Access)
Returns the parent object for the specified object. Read-only.
You can use the Parent property to determine which form or report is currently the parent when you have a subform or subreport that has been inserted in multiple forms or reports.
For example, you might insert an OrderDetails subform into both a form and a report. The following example uses the Parent property to refer to the OrderID field, which is present on the main form and report. You can enter this expression in a bound control on the subform.