If Lufthansa has to change your advance seat reservation, e.g. because of a late change in the aircraft type used, Lufthansa will do its best to reserve an equivalent new seat for you. In such cases, priority is first given to seating passengers who are travelling together, e.g. families, next to each other again.

Lufthansa’s policy regarding family seating is generally helpful, but it is not a 100% guarantee unless you pay for seat selection in advance. According to the airline's official guidelines, their system is designed to identify passengers on the same booking and automatically attempt to seat them together during the check-in process. This is especially true for families traveling with children under the age of 12. However, if the flight is very full and many seats have already been pre-selected by other passengers, the system may split the group. To avoid this, Lufthansa encourages families to use the "Advanced Seat Reservation" service, though this often carries a fee depending on your ticket class. If you are flying in "Economy Light," you are more likely to be separated than in "Economy Classic." If you find your family has been split up, the best course of action is to arrive at the airport early and speak with a gate agent, or politely ask a flight attendant once on board; Lufthansa crews are generally very accommodating and will try to facilitate a seat swap to ensure children are seated next to at least one parent for safety and comfort.