Humphrey Nightingale - whose son Danny was jailed for illegally possessing a gun - has told Daybreak that "whole situation is a farce", but that he is hopeful his son will be released.
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The British Muslim convert insisted he is not "currently" a fighter in Syria.
The four people who were all related were killed on the A64 near Malton as they returned from a wedding in Leeds.
Sir Philip Green said he is "sad and sorry for all the BHS people caught up in this horrid story".