Well to do that we need to modify tuque, and thats what I thought we were talking about, in particular this bit:

https://github.com/Islandora/tuque/blob/1.x/Object.php#L556-L559

You suggested "compare $ds->parent to the current object." Rather than the type check that was there, but I didn't quite understand the type check was there in the first place or what checking for the parent would achieve.