Enable me to report on merged ideas as related records

My team is tracking custom fields such as "Customer" on our ideas. When the ideas are merged together, I need to create a report that shows all relevant customers for an idea, including all the ideas that have been merged into it. This is not currently possible in reporting because I can show only the customers that are related to the "parent" idea, or the "child" ideas, but not both in one view.

It would be useful to be able to report on merged ideas as being related to each other in some way so I can consolidate their information.