Estate Law Questions? Ask an Estate Lawyer.
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You can try to seek a court order that declares that they were married based on witness testimony and other supporting evidence that you may have collected over the year. This is the law that applies. Once the court issues an order declaring and finding that they were married as of XYZ date, it may be submitted directly to the SSA or NYC Dept. of Health to issue a certificate. To do this you will need to file a declaratory judgment action. Here is one to use as a go-by.