During World War II, Princess Alice of Battenberg (the mother of the Duke of Edinburgh) was in the difficult situation of having sons-in-law fighting on the German side and a son in the British Royal Navy
Prince John with the brother closest to him in age, Prince George (later Duke of Kent). Johnny died just when WWI ended, in January The Duke of Kent married Princess Mariana of Greece and died flying for the RAF in WWII.
Princess Margaret caught in a candid moment Group Captain Peter Townsend. Despite being a war hero, Townsend's status as a divorcee made him an unacceptable marital choice for Margaret in the eyes of government officials and the Church of England.