This was a tradition that was first brought to my attention after watching Dr. Lee Brown’s interview and it made me search for some other information about the idea. This article created by the government of Alberta speaks to this phrase “all my relations” and also describes some other general commonalities in traditions and beliefs by some various Indigenous peoples. It is limited in that it doesn’t give specifics of each tribe, but has the value of comparing and showing commonalities between them.
https://www.learnalberta.ca/content/aswt/well_being/documents/all_my_relations.pdf