Hi NorthernWarrior,
In my family, each person of legal driving age has a vehicle designated to them. We are in a unique situation, and our family is spread out across almost 150 miles right now. Everyone has a job or task requiring them to drive for some reason, and it is a necessity. In my brother's family though, his wives all live in the same house, and share a minivan. In my experience, each family has to do what is best for their own situation when it comes to vehicles and transportation.