You weren't expecting the argument. Maybe it started during a routine check-in call. You mentioned that Dad's mail has been piling up again, or that his doctor flagged some new concerns. You expected your siblings to share your worry. Instead, one said, "He's always been a little forgetful," and another asked, "Are you sure you're not overreacting?"
It usually doesn't happen all at once. One year your parent takes a single blood pressure pill each morning. A few years later, there's a statin. Then a thyroid medication. Then something for arthritis, maybe a sleep aid, and suddenly there are seven or eight bottles crowded into a kitchen cabinet. Some have instructions that conflict, some were refilled at different pharmacies, and at least one expired months ago.
There's a pattern that family members often notice before they can name it. A parent who used to be sharp and social starts turning down invitations. A once-avid reader stops picking up books. The spark seems to dim, not because of a specific diagnosis, but because the days have lost their shape.