Interesting dream, thank you for sharing it. If it were my dream, I'd be drawn by the family three; you, your father, and your sister and then you're on your own and there's a stranger. Cars generally mean ourselves, how we interact in the world; it's important if you're driving or in the back seat or there's an accident, etc. So, this "stranger" car person got out of the car and chased you; I think too it might be a WMD says, you're away at college and on your own, "walking down the street of life" away from your past, etc. and it's either suddenly scary (did anything happen in the last week?) or, since we are every person in our dream, you're trying to chase yourself, get information to yourself or something but avoiding it (the guy in the car wasn't suspicious or alarming in the first place). The guy got out of the car instead of you getting in too, if you were taking control of your life like you wanted, you might have gotten into the car?

But that's what I would think if it were my dream; it's yours though so only what you "imagine" is what it can mean, you're the one doing the dreaming :-)