Related Rule
United Kingdom of Great Britain and Northern Ireland
Practice Relating to Rule 105. Respect for Family Life
The UK Military Manual (1958) states that in situations of occupation, “according to the Civilian Convention, protected persons are entitled in all circumstances to respect for … their family rights”. 
United Kingdom, The Law of War on Land being Part III of the Manual of Military Law, The War Office, HMSO, 1958, § 547.
The UK LOAC Pamphlet (1981) states: “In all circumstances, the … family rights … of protected persons should be respected.” 
United Kingdom, The Law of Armed Conflict, D/DAT/13/35/66, Army Code 71130 (Revised 1981), Ministry of Defence, prepared under the Direction of The Chief of the General Staff, 1981, Section 9, p. 34, § 9.
The UK LOAC Manual (2004) provides in its chapter on the protection of civilians in the hands of a party to the conflict that the “family rights, religious convictions and practices, and the manners and customs of protected persons must in all circumstances be respected”. 
United Kingdom, The Manual of the Law of Armed Conflict, Ministry of Defence, 1 July 2004, § 9.21.
The UK Military Manual (1958) states:
Belligerents must facilitate enquiries by members of families dispersed as a result of the war, with the object of renewing contact between them. They must also facilitate the work of approved organizations engaged in this task. 
United Kingdom, The Law of War on Land being Part III of the Manual of Military Law, The War Office, HMSO, 1958, § 38.
The UK LOAC Manual (2004) states:
The belligerents, and all parties to Additional Protocol I, are required to facilitate in every possible way the reunion of families dispersed as a result of armed conflict, to deal with their enquiries and (subject to security regulations) to facilitate the work of approved organizations engaged in this task. 
United Kingdom, The Manual of the Law of Armed Conflict, Ministry of Defence, 1 July 2004, § 9.11.