Said Abu Jamal, a cousin of the men, said their families in east Jerusalem received demolition orders from Israeli police today.
Police say Ghassan and Oday Abu Jamal burst into a crowded synagogue on Tuesday morning, killing four worshippers and a Druze Arab policeman with meat cleavers and gunfire before they were shot dead.
It was the bloodiest attack in a recent wave of violence by Palestinian assailants that has killed 11 people.
