You cant have kids. Its really as simple as that. U cant get married either.

Then how come there is a baby rat sutie next to the big one?

You have to have both the sims 2 for ds and the sims 2 for gba
Be aware, if you have a dsi, you cant do this.

You put both of the games in each ds slot, and uhh... There! You can have babies now, plus
its probaly gonna be hard because its 2012, so its pretty obvious not much gba games are
around that much anymore.

Hu i've always wondered what that small case wuz 4 in the rat cave was i'm gunna get the
gba version used i and use my old ds (since i got a dsi now) to do this