[b]*WARNING, MIGHT BE CONSIDERED AS A SPOILER[/b]* (A bit late now, i know. :P)
Well. I just played through F3 again, and finished it, but...well, you know how your father is supposed to die in the purifier? Well, in this game he was still alive standing in rivet city, because I'd somehow gotten into vault...74 is it? Where the G.E.C.K. is, got the G.E.C.K. then got captured by Enclave and carried on the mission from there, but when I went to check Rivet City my father was just standing there all merry. :P
When I play RPGs I'm not in a hurry to finish them. But yeah, please add spoiler alert next time because I was planning on finding out when I finished it...
Really sorry guys :( I totally understand what the end being spoiled is like, someone spoiled a massive thing for me about F3, when i was just starting.