If you believe there were mass graves in a similar vein as you see in Israel, Nazi Germany, or other similar genocides, you haven’t looked into it all that much. There was no mass execution of First Nations. They had a higher rate of death among children as a demographic over a roughly 150 year period during the operation of the Residential schools. There were children that died while at residential schools – some who were buried in unmarked graves and/or buried in places their next of kin didn’t know. Even the headlines that get posted generally highlights that they’re “unmarked” graves, not “mass” graves in recognition of this fact. This was mostly during the earlier parts of that time line, where things like “phones” were less common (so you couldn’t call their parents), the older generation couldn’t read/write (so a letter to notify parents may’ve been sent but would be less effective), and moving a corpse across the country to a small remote community was incredibly expensive. The times journalists try to sensationalize it and claim it as a ‘mass grave’, they’re generally referring to an area with multiple unmarked graves, where the children were laid to rest by the church (individually) – basically a big graveyard without headstones, that formed over the 100+ year period, as the church buried kids incrementally one by one over that period.

But the Church was never rounding up and executing children by the hundreds in a planned approach to snuff out the lives of an entire people. The root of the ‘genocide’ is/was that the Church and Canada was (arguably) intentionally and systematically using the residential school system to convert FN into more western ways of thinking and cultures (“killing” the culture, not the people – sorta more like how Russia abducted a bunch of Ukrainian kids, and is systematically indoctrinating them into Russia). That, coupled with an aggregate statistic over a century, is what’s used to call Canada genocidal and lump the country in with what’s going on in Israel currently.