ok, so a litl background,

im a relatively big guy, well built and fairly fit, so im not one to be easily intimidated.
my uncle on the otherhand, whom i have to live with due to cheapness and university, is larger then i, but mostly from fat.

my problem is, is that he will always use violence, or the threat of, to get his point across. the thing is, i am so against violence, there is no reason for it ever unless in terms of protection. so realistically speaking, this guys a bully. but i dont know how to deal with him.

ive tried talking to him but hell button up the second i let on that im accusing him of anything. recently i chanted him down and called him a bully to his face in front of most of the family including his older brother who showed me some marginal support, but the bully ended the conversation with a button up.

my question is, how do i talk to this guy like were normal humans, or can i even talk to him period? what happens if i pull in a pro, a professor from uni to talk to him, what happens then?
im at a total loss, but if my life is going to be stress free to deal with uni and only uni, what do i do?