Currently 4D has commands that allow to retrieve parent tables given the child table. On the other hand, what if you want to know all of the child tables given the parent table. An easy way to get this information is is in the Quick Report application.
-Launch the Quick Report application and select your Master Table (Parent table) in the Report Parameters Area.
-Select "Related Tables" from the drop down menu.
-The window pane below should now display a list of related tables and fields. If the arrow is pointing to the left, the table is a child table.