(1) If a resident has multiple residences in Germany, one of these residences is his or her principal residence.
(2) The principal residence is the residence used most by the resident.
(3) The secondary residence is any other residence of the resident.
(4) Whenever registering or deregistering, the person required to register is to inform the registration authority of which other additional residences he or she has in Germany and which one is his or her principal residence. He or she is required to inform the registration authority responsible for the new principal residence within two weeks of each change of principal address. If the person required to register moves out of one of his or her secondary residences in Germany and does not move into another residence, he or she is required to inform the registration authority which is responsible for the secondary residence or the registration authority which is responsible for the sole or principal residence thereof.