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Convention (IV) relative to the Protection of Civilian Persons in Time of War. Geneva, 12 August 1949.
Grouping of internees
The Detaining Power shall, as far as possible, accommodate the internees according to their nationality, language and customs. Internees who are nationals of the same country shall not be separated merely because they have different languages.
Throughout the duration of their internment, members of the same family, and in particular parents and children, shall be lodged together in the same place of internment, except when separation of a temporary nature is necessitated for reasons of employment or health or for the purposes of enforcement of the provisions of Chapter IX of the present Section. Internees may request that their children who are left at liberty without parental care shall be interned with them.
Wherever possible, interned members of the same family shall be housed in the same premises and given separate accommodation from other internees, together with facilities for leading a proper family life.
Commentary of 1958