With regard to so-called ashes. For me they have absolutely nothing to do with the person who has died. Even if you get the correct ones (and how on earth would anyone know), it is more ashes of the coffin.
With my parents, I arranged with the Crem to do as they wished with them - had nothing to do with me. For my son, I was in such a stage of shock I found myself collecting that plastic urn of them. Never knew what to do with them, kept them in that for several years in shed and when i moved out of that house, noticed the plastic had cracked so very little left in it.
Have told Co-op funeral plan, to do as they wish after my crem, not to disturb my family about them.
To me, the death of a person is their end, BUT, hopefully there are many memories of their life to be talked about, discussed and whilst there are people around who have those memories, that is their little bit of eternity.