Thank you for your question.
The parent is obligated to pay support until the order is modified by the court. Moving back into the home and providing support to the child in that way can alleviate a parent from having to pay child support. The payor parent would have to petition the court for a modification, and will have to show that he/she provides support to the child by virtue of living with the child.
Yes, in that case, he was not supporting the child, and you can go after him for non-payment of support.
It is possible that he could get some credit towards his child support arrears because he was helping pay the mortgage, but that is not likely. In either case, he still owes the child support for that time period.
Regarding service of papers, you can ask the court to serve by publication in a newspaper. You have to swear that you made diligent search for him, and that you were unable to find him.
DISCLAIMER: Answers from Experts on JustAnswer are not substitutes for the advice of an attorney. JustAnswer is a public forum and questions and responses are not private or confidential or protected by the attorney-client privilege. The Expert above is not your attorney, and the response above is not legal advice. You should not read this response to propose specific action or address specific circumstances, but only to give you a sense of general principles of law that might affect the situation you describe. Application of these general principles to particular circumstances must be done by a lawyer who has spoken with you in confidence, learned all relevant information, and explored various options. Before acting on these general principles, you should hire a lawyer licensed to practice law in the jurisdiction to which your question pertains.
The responses above are from individual Experts, not JustAnswer. The site and services are provided “as is”. To view the verified credential of an Expert, click on the “Verified” symbol in the Expert’s profile. This site is not for emergency questions which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service (last updated February 8, 2012).