Ryan and Seth are brothers according to O.c series.Seth is is the Biological son while Ryan is the adopted one but what are similarities and differences Similarities 1 They are both males 2 They love their chicks 3 They keep entering girl drama issues 4 They love to hang out 5 They both have the nack for trouble 6 They both love their family 7 They both love playing computer games Enough of the similarities let's check out the differences Differences 1 They don't have the same genetic make up 2 Seth as lived in O.C all his life while Ryan grew up in chino 3 Seth lived in the main house while Ryan lives in the pool house 4 Seth enters meer female drama compared to Ryan 5 Seth as never gone to jail 6 Seth doesn't have a brother in jail 7 Seth loves sailing meer compared to Ryan 8 Seth is meer funny 9 Ryan alway wears his overhemd, shirt unbottoned tonen off his underwear while Seth is always buttoned up 10 Ryan wears a hand band while Seth doesn't 11 Ryan pulls up his overhemd, shirt from wrist to ankle while Ryan doesn't This is so compelling because no matter their differences they'll always stand up for each other and they fit in into anything . u will not even know there is no genetic connection and they really look like brother since the Dad and Mum have Brunette hair AND Blonde hair respectively