Wiper blades are one of the few car jobs that can be finished in a parking spot in the time it takes to make coffee, but only if the blade is the right one and the arm is in good shape. If either is off, a ten-minute job becomes an afternoon, so check both first.
Local option: New Plan Care gives families in the St. Louis area in-home help so a parent can stay home: companionship, help with bathing and dressing, meals, and overnight care. Call (314) 405-0887.
Do it yourself if these are true
The blade is not bent, the rubber is not torn, the arm lifts away from the glass and sets back down flat, and the windshield is not cracked in the wiper path. Buy blades by the size printed on the old blade or listed in the owner's manual, and buy both sides at once, because the driver's side usually wears first and the passenger side is not far behind. Check the attachment type before you buy. Blades connect to the arm in different ways, and a blade that looks right can still sit loose if the adapter is wrong.
Have a shop do it if these are true
The arm is bent or sits up off the glass, the arm will not lock into place, the rubber has split, or the wipers still chatter and streak after new blades go on. Those are not blade problems. A shop can check the arm, the pivot, and the glass, and they can fit the blades while he waits. Ask whether installation is included when you buy, and ask them to run the wipers once in front of you before you pay.
Test before you decide
Run the wipers on a dry windshield for a few seconds, then spray washer fluid and run them again. Look at the glass in daylight from the driver's seat. Streaks across the whole sweep usually mean the blade is finished. Chatter in one spot usually means the blade is worn or the arm is out of line. If the car sits for weeks at a time, the rubber can take a set in its curve, and the blades may need replacing sooner than you would expect.
The part that is really about him
He may want to do this himself in the cold because he always has. Offer him a warm spot, a pair of gloves, and the job of choosing the blades from the box. Let him do the swap if the test shows the blades are the only problem. If he hands the job to a shop, that is not giving up. It is one less thing standing between him and the car in the middle of winter.