Implement a display_heavy_footprints function as a custom method or in a module in the display_firefly backend. This method will take a sourceId as an argument and possibly also a dataId for a Butler instance.

The method will find any parents, children or siblings of the selected sources. It will identify a common bounding box.

The method will generate images inside that bounding box for 1) the origin image, 2) the parent heavy footprint, and for all children. It will package all these in a format that will allow Firefly to display them in a locked fashion, such that the user will be able to use the existing Firefly UI for flipping between these images while having them aligned in pixel space.