Thanks for the tree. I had a long search for this item...before I ended up here
*Usage of the tree*
In short:
1. Enter a lot
2. Buy the tree & click on it (Normally you must type a cheat to get this tree)
3. You will see menu's that give you the option to customize townies & NPC's
4. For further explanation...search for tutorials on i-net. They're not hard to find
5. No child NPC's: I guess Maxis doesn't want to encourage 'child labor' ingame.
6. No child townies: Probably also a reflection of real life. Children dont show up on community lots or walk the streets...on their own. Meeting them in public, would mean an adult family member or nanny has to escort them. That would make the game a bit complex.