The answer to your question depends hugely on how proactive the mother is in pursuing the support. If she does nothing, it could be quite sometime before anything happens, perhaps several months if not a year or more. Conversely, if the mother is very proactive, she could have you in court within about a month's time of being late.
As to the ongoing support obligation, it is clearly subject to a modification. Child support can be modified where the custodial arrangement has been changed or where the financial situations of the parents have changed, for example. Here, both of these factors are present. As one child has been residing with you, this would suggest a decrease in your support obligation. If your income has decreased, that too would suggest a decrease in your support obligation.
With these things in mind, you might consider being proactive yourself. You could petition the court for a reduction in your support obligation arguing that the son has been residing with you and that your income has decreased. Filing such a request would go a long way towards preventing a finding of contempt for being delinquent on your support obligation.
Please let me know if anything requires clarification.
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