The problem is rarely the mess itself. It is the walkway: the strip of floor between the bed, the bathroom, the kitchen and the door, which shrinks a little at a time while everyone is busy. Clutter is the sign. The route is what you are actually solving for.
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Name the spots that matter
Pick the two or three places Dad has to get through every day: bed to bathroom, kitchen to chair, front door to porch. Those are the spots where a box, a stack of mail, or a laundry basket changes what he can do. Note the narrowest point on each route, measured with a tape from the wall or furniture on one side to the wall or furniture on the other.
Tell a pattern from a bad week
A single cluttered weekend means little. A pattern shows up as the same route narrowing across several visits, new items arriving in the walkway without being moved out, and the same spot being bumped or stepped around. Walk the route on the same day each week for four weeks and write down the narrowest measurement and anything new on the path. If the number drops and the items stay, the clutter has become the problem.
Ask who else sees it
Ask a neighbor, a relative who visits, or a delivery driver whether they have noticed the same spot. Outside eyes help separate what looks normal to Dad from what looks blocked to anyone else. Keep the questions factual: where the stack is, how wide the gap is, and what he has to step over.
Decide what counts as a fix
Before any cleaning starts, agree on the target: one clear route, a set width, and the items that move out of it. A clear route can be kept with fewer items, a bin by the door, or a stack moved to a room he does not walk through. Do not promise to clear the whole house, because that is the goal most likely to stall.
Next move
Measure the narrowest point on the bed-to-bathroom route and the front door route, write both numbers on one card, and tape the card inside a cabinet door. Walk the route again in four weeks with the card in hand and compare the numbers. If the same spot keeps narrowing, you have your answer about the problem.