Why not? A family member can help, just like family members drive frail 90yo people around. What 90yo people shouldn’t do is operate heavy machinery such as a car.

I have never suggested that they be the ones doing the driving, and no, you're not just going to wheel them in a wheel chair through snow storm or freezing rain. On top of the potential physical impossibility of pushing a wheel chair through snow, they might literally die on their way to their doctor's appointment.

With a cargo bike or a bike with a trailer. Or by walking around with a utility wagon.

Again, how are you getting through a snow storm? Or a rain storm? Is your load of thousands of dollars worth of power tools going to be fine sitting in a bike trailer in extreme weather?

Rent a van the one day a year that you need to do stuff like that.

Oh wow, congratulations, now you've arrived at the fact that we do needs roads and infrastructure for cars!

Don’t pretend it is reasonable for one person to use a 4000lbs pickup truck to commute to work, given the externalities that imposes on other people.

Bruh, tell me where I said that.

Many families like mine live car-free, so instead of claiming that is impossible you may want to figure out how they do it.

No you don't, you live a life not owning a car, but you still ultimately need them and some infrastructure to support them when you use taxis/ubers, rent cars, and rely on thousands of workers and people who do use them.

Cities still need to be designed to be able to support cars, they also need to be designed to support pedestrians, cyclists, and to encourage as many people not to use cars as possible, but at a fundamental level cars are and will forever be a necessary part of our last mile transportation infrastructure. Pretending otherwise just makes anti car people look ridiculous and not get taken seriously.