If the only petition you filed is for downward modification, you will not be receiving any child support from your ex. You would have needed to file two petitions. One for downward modification and the other for support of the child living with you..
In addition, you should make sure that your old order at 25% is not less than 17% of your current income. Sometimes people earn more money and 17% of a larger amount is more than 25% of prior income.
Two points are relevant on your petition for support against the mother. First, if she is working less than full-time, the court may impute full-time income by multiplying her hourly rate times 40 hours. Second, as to income paid by roommates, it will be difficult to prove the income if your ex denies that she receives any money.
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The judge may take into consideration all of the income that is being made in the household, although, only her income counts for the purpose of support.
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