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Creating a link field on Parent Object to access a child record

The business don’t want to add another related list, they want a linkable field the user can click to view the child record tied to the parent record. 
If there is only a single child (or there is a "more important" child) you can add a Lookup field on the Parent object and then have a trigger that when the child is inserted the child field on the parent is updated with the child Id.  Or you could do this in Visualforce.