There is not enough information here. However, presuming that the child support order was established in Nebraska, a parent pays child support for a child until their 19th birthday. Thus, when your son and oldest daughter reached the age of majority, your child support should have theortically went down presuming that the child support was based on income that did not put you below the poverty level. If the father is filing a modification of child support seeking more support, you have a good defense that he should not be the one receiving the support since the only child who is a minor is living in Boston. Given the lack of some information, it would be best to contact a local family law attorney.
Although I am licensed to practice law in the State of Nebraska, this communication does not establish an attorney client relationship. This answer is not a substitute for legal advice from your attorney. It is meant as a brief overview of the process to enhance your knowledge about and comfort with the basic litigation process.
You need to get this straightened out. Contact a local lawyer for a consultation. Someone needs to intercede on your behalf.
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Contact a child support attorney immediately. Your support should have gone down after your two older children turned 19 no matter who's custody they were in. You will need to bring in all your old court paperwork as well as what your ex has filed recently.
I am a licensed attorney in the state of Nebraska. However, the advice I give here is not to be taken as legal advice. It is merely my opinion based on the limited information given. In order to assure that your legal rights are being properly represented I would always recommend going in for a consultation with an attorney to explain your case in detail and answer any questions the attorney might have.