Well, if you're going be the basic accepted definition of disowned, nom is right. If you're not planning on predeceasing your parents and leaving them something, you've really nothing to disown them from.
If you're talking emotionally that's a different story. I don't 100% agree with DG. Yes, they are the only parents you have, but the sad truth of the matter is that there
are ****ty parents out there. I'm not just talking the kind that beat or neglect their children. There are myriad ways to f*ck up one's offspring.
When the Alec Baldwin brouhaha happened a few months ago, I had to laugh a little smugly at all the people up in arms about it. He sounded like my mother on a
good day. I have on more than one occasion in my adulthood severed ties with her. The latest time I thought I might never speak to her again, but I did. Perhaps someday I'll regret that there was a time when we weren't speaking, or perhaps at some point in the future our relationship will have ended for good.
At any rate (and DG, this isn't directed at you personally, I'm just bouncing off what you said), while I do believe that it should be a last resort, there are times in your life when it's perfectly acceptable to completely sever ties with another human being, even if that human being is a family member.
I'm not sure if that's the kind of answers you were looking for (and I'm not even sure you're ever really looking for answers as it is), but there you go.
And unless the circumstances are really unbearably extreme, I wouldn't recommend doing it while one is still in college.
"How do you like THAT 'misanthropic panache,' Mr. Goldstone?" - PalJoey