Help! i just saw Terminator:Salvation?

ok, so i haven't seen any other terminator movies...i know i know what kinda guy am i right? Anyway, could someone please clearly and shortly (don't make this 2 pages long) sum up what the hell was going on? Seriously, the time travel stuff confused my the sh*t outa me. Someone was someones fathers sons mothers uncles brother or something....just.....tell me what that was all about. Please