Originally Posted by
Ghoulish
It would be a simple IT matter to require any itinerary with child tickets to require mandatory advance seat selection next to an accompanying adult.
Pax with other safety impacting special needs are routinely turned away if they didn't make the necessary arrangements in advance.
For free.... Dont forget that bit. They get to reserve their seat for free in advanced if they have specific disabilities. See BA terms.
Anyway, good luck for the flight original poster. Hope the kids enjoy their holiday and the flight isnt too much hard work.