Question juridique clé
Whether the grandson actually lived in the appellants' household so that the rent had to be split under EL rules.
Solution extraite
The court found it more likely than not that C.___ lived with the appellants in E.___ during the relevant period, with a military-service interruption.
Motifs extraits
The residence registration, witness evidence, and surrounding circumstances outweighed the appellants' version; no convincing reason was shown for a false registration.