<Tr> <Th> Brothers </Th> <Td> Ryan Atwood </Td> </Tr> <Tr> <Th> Half - brothers </Th> <Td> Cooper Atwood </Td> </Tr> <P> Trey Atwood is a fictional character on the FOX television series The O.C., portrayed by Bradley Stryker during season one and by Logan Marshall - Green from season two onward . Trey is the older brother of main character Ryan Atwood and grew up with him in Chino with their mother, Dawn Atwood . </P> <P> Like his younger brother Ryan, Trey has a quick temper but is more impulsive where Ryan is more controlled . This often puts the brothers at odds with other, and, on several occasions, Ryan has had to step in to drag Trey away from potentially causing a fight and drawing even more attention to himself . </P>

Who played ryan's brother in the oc