Is there an easy way to track down the parent of an external ref?
When I click the cube (sketch relation) the parent sketch appears on my screen. So, how do I find the parent so I can edit it?
Right click on the sketch and select "List external references". The pop up window file give you the file name with path plus all references details.
If the sketch is in the same part file then right click the sketch and select "Parent/Child". For different file then as Deepak said.
Also if you hover over the offending relation then it will show a little text to what it is related to. Image below was made while I was in sketch2 of Part1.
Also look up the Display Delete Relations tool, it is pretty handy.
Retrieving data ...