Another perspective perhaps:
the 4th represents the influence we experience from the parents;
the 8th reflects the psychological [Scorpio] inheritance we received from them;
the 12th: the subconscious effects we are left with; either the desire to retreat from the demons left behind, or the search for healing through spiritual sanctuary.
Indeed the 8th H can be rather enigmatic, and difficult to interpret given it's normal associations. As I see it, since the 2nd house relates to personal material resources, the 8th is more about spiritual resources, which is often the only remedy in overcoming the hurdles that plague us in life.
The 8th H relates to crisis and critical events, which are typically recorded at the emotional, and psychological level. Scorpio's natural rulership of this house shows survival and transformation, thus the planets therein can denote significant psychological patterns that are indeed deeply imbedded in the psyche.
In my own case, I have cancer Sun and Jupiter in the 8th, but opposed by Mars; in my early 30's I did experience the death of my parents and I believe the opposition told the story of the troubles that ensued over the inheritance from my father [ sibling conflicts]. Many years later my father-in-law also passed, leaving us to serve as caretakers for the elderly mother and handicapped brother. Then, just last year the mother-in-law also passed. Themes of death have certainly followed me in life, while the transformations they caused were significant to my own personal evolution.
With Neptune in my 12th I have certainly had to shore up my spiritual faith and my considerations about death.
“Death is not the beginning of the end; it is the return to innocence.”