Family Law Questions? Ask a Family Lawyer Online.
The new spouse's income is not relevant for child support determinations. Although, as a practical matter, he does of course support your husband's child to some extent, he has no legal obligation to your child as a step-parent. The court only considers the incomes of the biological parents.
The fact that he did not ask for child support is also not going to help. Sorry, the custodial parent is entitled to support, and the fact that he did not exercise this right does not mean that is ex is barred from doing so.
Sorry, I wish I had better news, but this is the reality of child support and your situation. My policy is to just give the truth, rather than tell you what you want to hear now, only for you to end up more frustrated.
All of that said, if he is unemployed, that IS a factor and his support could be reduced because that.