Geneva Convention (IV): Relative to the Protection of Civilian Persons, Part III, Section 4, Chapter I
The Parties to the conflict shall not intern protected persons, except in accordance with the provisions of Articles 41, 42, 43, 68 and 78.
Internees shall retain their full civil capacity and shall exercise such attendant rights as may be compatible with their status.
Parties to the conflict who intern protected persons shall be bound to provide free of charge for their maintenance, and to grant them also the medical attention required by their state of health.
No deduction from the allowances, salaries or credits due to the internees shall be made for the repayment of these costs.
The Detaining Power shall provide for the support of those dependent on the internees, if such dependants are without adequate means of support or are unable to earn a living.
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.