Travel documents for minors – Luxembourg
In addition to their own valid travel document (passport or ID card), minors of Luxembourgish nationality travelling out of the country without their parents must be in possession of adefr issued by the municipality of residence which will certify the parents' signatures. They do not need any other specific document to re-enter Luxembourg.
Minors from another EU country must also have parents' approval to enter Luxembourg. If the minor is only visiting Luxembourg (i.e. on a tourist visa or for a visit of less than 90 days), no other specific document is required for them to leave. But, if the minor has been registered with a Luxembourgish Municipality (i.e. the child has stayed in Luxembourg for more than 90 days) and is leaving the country, he/she needs to deregister with the local commune.