The law of the jurisdiction where you and your daughter live will govern the support calculation. Ordinarily, the court will not use new spouse income to calculate support, except in some extremely limited circumstances. Father's income may be deduced by examining his living expenses. He had to have income to pay those expenses. Comprende?
In California, they will not use his new wife's income to calculate child support. The only reason that they will even want to know his wife's income is for tax purposes. California child support orders are set pursuant to California child support guidelines set forth in California Family Code Section 4055. In calculating your ex's child support obligation, they will put him in as "married filing jointly." Therefore, they will want to know how much his wife earns so that they can put her income under the "new spouse's income" category. That way, the formula will calculate your ex's net income and his tax liability based on how much his new wife earns. The more his new wife earns, the more he pays taxes on his income and thus, the less he takes home and therefore, the less he pays you. Child support is really based on net income. However, before getting worried too much. His wife's income may decrease his child support obligation to you by very little. It may lower it by about $20 or $30 per month depending on how much his new wife makes. But, it will certainly not increase his child support obligation to you, as you may be hoping.