cousins don't really have any particular specific. i think most are on his mother's side right now, but beyond that is is pretty open. the step siblings are 'related' by his father's second marriage to a woman from daejeon however many years ago (he was ten when they divorced, so it would be like, 15). jin has gone to a few family functions, but just recently severed ties with his father, so there may be some - what's the word i am looking for... friction, i guess? just generally trouble getting along (which is a lot of jin's fault), which probably doesn't sound very appealing when most parities in game get along, but its something!