Getting the passport in the U.S.

You have to make stage two application in person in Luxembourg (that is once you have been issued a letter from Luxembourg making a declaration that you can establish a direct lineage based on the criteria given by the government. Once you receive your letter from Luxembourg, you can then apply for the passport. That requires a person personally appear in the embassy with additional information (FBI and Interpol checks that must include biometrics). If you have been convicted of a crime or have a DUI or DWI you are out of luck. For me that was Washington D.C. You can also return to Luxembourg. You must have a photo that meets European standards. These are difficult to find in the U.S.A. and must pass the strict requirements of a European passport photo. This is a big deal. Then the application is submitted, more biometrics are taken, payment is given and you wait. When the document (passport and ID card) arrive in the embassy, you must make arrangements to have it shipped or you can pick it up in person. When the document arrives, you must submit two receipts that are provided at the time of application. If you don't return these by the deadline, the passport will not be validated. When the embassy receives these documents, the work is complete. This process, from start to finish is time consuming and tedious, but in the end can be done if a person qualifies and sticks with the process.