Well, I was with my mom when she bought the car new, it changed hands to me an no one else. That would more emulate the term I use, but they's a lot of veriables in the term itself. My name is on the title now so it's not a one owner car car anymore. "original owner" an "family owned" are 2 different things in the monitary sence, but in my opinion it should'nt take anything away from the car cause the car hasn't been "out of your sight" so to speak. You would be the 5th or 4th owner dependin on weither your Father-in-law put his name on the title or just bought it an gave it to your wife. It went through more members of your family than mine did, but if it's been in your immediate family the whole time, I would consider "family-owned" an accurate description. But if the car was in your in-laws family before you joined the family, then I don't reallly think you can tecnically use that term, no offence.