Former Israeli fencing champion Kobi Hatuel, 20, was arrested on Wednesday for allegedly running a drug manufacturing ring together with his parents in the North, it was released for publication.
On Thursday, the Nazareth Magistrate's Court extended his remand by five days.
His mother Orna's remand was also extended by five days and his father Uri's by eight days.
The three, from Nahariya, were arrested by police from the Central Investigative Unit in the Northern District after they allegedly produced 18 kilograms of hashish and planned to distribute it throughout the country.
Police raided the Hatuel's home and seized drug-manufacturing equipment, 18 kg of hashish and NIS 60,000.