Polish gaming site Gry-Online has posted a nice Fallout 3 Q&A. Of special interest is the section on modding and children in Fallout 3:
Shuck: Allegedly there are supposed to be children in-game. Are you going to be able to kill them, like in previous titles?
Emil: That we do not know yet.
It is one of the most important topics to think out. The thing is,
we're dealing with a next-gen game and we're not only talking about
killing, but exploding heads and eye balls rolling down the street. As
a designer, you need to ask yourself if you want such elements in the
Shuck: We're also dealing with an RPG game, which should leave as many choices as it can to the player.
Emil: Indded, but there are a lot of problems that need to be taken into account.
Shuck: So tbe children are not neccessarily going to appear in Fallout 3?
Emil: They will positively be there, but we don't know if they can be killed.
...Shuck: Do you plan to support the modding community by providing them with tools?
Emil: We don't know yet - we're
discussing it. It is something we've done for Oblivion, but this
doesn't automatically mean we'll do the same for Fallout. The truth is,
preparing such tools takes a lot of time, and this is time lost to
production of the actual game. We shall see.
Shuck: Is this caution caused by the trouble caused to you by the infamous Oblivion mod?
Emil: No. But it is a fact that when you release modding tools, you loose a great deal of control over your game.
Read the whole thing here.