Would you ever forgive your father if this happened to you?

By the time you reach the point where your dad is pointing a gun at you, the familial ties are pretty well dissolved. Had the dad not forced the issue, I definitely would have suggested vacating immediately. I'm a horrible spiteful person who would have pressed charges to boot, but breaking all ties is the bare minimum.

Depending on who holds the titles on the cars, there's some criminal charges involved there, too. How exactly did this guy "disable" all the cars?

Jam it back in, in the dark.