Help regarding laws for Michigan child support when non custodial parent has more than one child support case.

My child’s father has lost part of his wages and has been granted by the FOC a decrease in my child support amount, however he has not asked for a decrease in his other child’s support payment, which means, my child, based on the way the funds will be allocated, will now only get 10% of funds collected, can I fight this in court? Can I get the court to order him to review the other case, so that support can also be adjusted to his new pay?