Somehow I just can't imagine my Republic Trooper coming home from a hard day of work shooting at various forms of Imperial scum bag just to change Junior's huggies.
Of course I'm not saying the feature shouldn't be implemented. In a game like TOR the whole thing revolves around the concept of choosing how you shape your character for yourself. And from that stand point I think that if your character can get married then I don't see why you can't start a family. It would be a nice option.
But for me, I signed up to shoot stuff with a blaster rifle, not to spawn little NPCs to mess up my Thunderclap while I'm out securing the safety of the Republic.