Three sons and three grandchildren of the political leader of the Palestinian militant organization Hamas, Ismail Haniyeh, were killed in an Israeli attack in the Gaza Strip on Wednesday, Hamas sources in Beirut confirmed. According to a report by the Shihab news agency, they were hit in a vehicle in the al-Shati refugee camp in the northern part of the coastal strip. Haniyeh was quoted on a Hamas Telegram channel as saying he was “honoured” by what he termed “the martyrdom of [his] three children and some grandchildren.” “I thank God for this honour,” he also said. An Israeli army spokesman s…