In the state of Nevada, the courts follow guidleines enacted by the legislature to determine the amount to be paid in child support.  Now, courts are permitted to adjust the amount a parent is to pay (generally 25% of gross monthly income for two children) by taking in to consiferadtion various factors.  One of these factors in indeed the "The legal responsibility of the parents for the support of others."  How that fits in to the facts of your case is unclear here but I would speak with ana ttorney in your area.  Good luck.