A Sydney family has received a threatening letter in the mail — all over a flag displayed on its roof. The family, who has asked to remain anonymous, is from the city’s south and has a Palestinian flag flying from the home’s TV aerial. WATCH THE VIDEO ABOVE: Woman flying Palestinian flag receives written death threat. Watch the latest news and stream for free on 7plus >> A letter arrived in the mail on Friday morning, address to a fictional ‘Ahmed’ and stamped with the family’s address. “I hope you have bulletproof windows,” the expletive-laden letter reads. “Your car will...