I think child support should be a percentage (ex. not to exceed 30%) of the noncustodial parents income. Total. For all dependants (kids & spouse) supported. If noncustodial dad goes and starts a family with someone else, then the amount is adjusted for everyone to equal amounts. So, if he makes $2400 per month, and is paying child support to his two kids, he pays $360 per month per child. Say they have the same mother, she is receiving $720. He has a baby with someone else. He will still pay $720 in child support, total. Each child will then receive $240 per month. The mom with the two kids will get $480 in child support. If he marries the second child's mom, a formula will be used to calculate what "support" he owes her based upon the ratio of her income to his. That is then calculated into the support division.
ETA for further discussion:
1. There should be a formula where the parents incomes are counted and each pays according to a set ratio...though no having the CP having to pay the NCP child support because the CP is a bazzilionaire and the NCP can only find a minimum wage job.
2. Unless the CP expressly reserves the right in the first papers, any raises in income by the NCP cannot be considered for child support purposes.