death is a single sad event. A specific day.

Unexpectedly becoming the sole caregiver of an aging parent seems different to me. I can imagine some resentment, especially if it’s unexpected _and_ one is already the caregiver for their own spouse, children, etc. It changes your life plans, adds additional daily stress in your life, and may also add financial stress.

everything you said also applies in the death of the other parent: unexpected, sole caregiver, aging parent, changes life plans

Even if they don’t divorce and one dies it changes your life plans

The only thing different is the bummer of divorce and the emotional fallout from it