Well, on the one had I agree with you (don't want to play a reverse Fallout 3 (you are looking for your wife and child now instead of your dad, like in Fallout 3) that much after all), on the other hand:
Why would they go through all this trouble (making both advlts customizable, creating the baby based on them) only to kill them off after a few minutes (our hours...I mean we don't know how long the pre-war section of the game is - many think it was streamlined in the presentation at E3, which is what I hope, too as I want to spend more time in the pre-war era (go explore a bit etc.)) into the game?
Food for thought
greetings LAX