EGYPTIAN authorities are holding the founder of the country's largest dairy products and juices producer and his son in conditions that amount to torture because of their refusal to cede their assets, according to Amnesty International. There was no immediate response to a request for comment to Egypt's state information service. The arrests of Safwan Thabet, founder and former CEO of Juhayna, in December, and of his son Seifeldin two months later, shook Juhayna, a household name in Egypt. The authorities accuse them of belonging to and financing a terrorist group -- commonly a reference to the outlawed Muslim Brotherhood…