Falls and locked doors are the events that get everyone's attention. Most of the time, the problem showed up weeks earlier in the house, as a small change nobody wrote down. Learning to read those changes tells you whether you have a problem before it becomes an emergency, and it gives you something concrete to name when Dad says he is fine.
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Build a baseline first
You cannot spot a change without knowing what normal looks like for him. On your next visit, or during your next call, note what the house looks like: the mail on the table, the food in the fridge, the dishes in the sink, the car in the driveway, the laundry, the trash. Write it down with no judgment. That list is your baseline, and it is what you compare against next time.
Watch the quiet signals
The signals that tend to matter are ordinary. Mail stacking up unopened. The same food sitting in the fridge until it goes off. Dishes that stop appearing, or appear in a pattern that suggests meals are not being cooked. Unanswered calls that used to be returned within the hour. A car that has been moved or dented without explanation. Stories that do not match from one call to the next. Bills that begin arriving late. None of these prove anything alone. Together, across a few weeks, they describe a pattern worth naming.
Separate one bad week from a trend
A single messy kitchen is not a problem. A kitchen that gets messier every visit, while the mail and the unanswered calls move in the same direction, is. Look at the direction over at least three observations before you decide what it means. Two or three signals in the same stretch mean the problem has shown up, even if no one has fallen.
Do not diagnose from the doorway
These signals tell you something has changed. They do not tell you why. Do not treat the list as a diagnosis, and do not take the pattern to mean a specific condition. The useful move is to name the change clearly and bring it to the people who can assess him, such as his doctor, while keeping the family's own record straight.
If you want to see how this desk handles that kind of naming, the How We Write page explains the rules behind these plays.
Your next move
On your next visit, write the baseline list from the first look at the house, not from memory. On the visit after that, check the same five items and write down any that moved in the same direction. If two or three moved, call the person who owns the check-in and say the pattern out loud.