How do you buy car insurance online if you want to drive your dons vehicle?

He has full coverage but I am excluded on his policy because we have the same address. I no longer have a car so I don't carry insurance anymore but want to be covered if I need to drive my son's car.

all you have to do is have your son add you to his policy....he has to to do this because he is the policy holder....and you having the same address has nothing to do with being on his insurance....i did the same thing with my daughter her car was in my name and i added her as a driver simple as that!