The problem is that AL changed the handout which changed the code, too - pre-AL it used to be that no matter how many sims you put in a family, you got 20k and that was it. Post-AL, you get a base rate of 20k for the first sim, then an extra 5k per child and 10k per adult (or at least I THINK those are the rates from what I remember of reading the AL guide).
I don't know the exact rates, but I recently created a family with two adults, a teen and two children and got 32k.
About the hack it works fine, even if the AL code is somehow different. I just have to make the sims give back some money if they've got too much