Do I need my own insurance to drive my mothers car?

What is the top website for Cheap Motor Insurance?
"Our daughters father needs us to acquire it and requires a new. I'd be co signing around the insurance along with the auto wouldbe in my name. It would mostly be his automobile"Im trying to find auto  insurance  in california im 22m and im scholar and this is my  insurance  "Any diff for having  insurance   for new/previous/second hand vehicle