Explosive revelations from the parents of the Queensland man who stabbed 18 people on Saturday killing 6 of them. Joel Cauchi's father has told of his son's history of mental illness and his fascination with knives, both of which were reported to police. 7NEWS at 6pm. Subscribe and set 🔔 » https://7news.link/YTSubscribe | For the latest Australian news and breaking news alerts, connect with 7NEWS online: Visit » https://7news.com.au/ 7NEWS Podcast » http://smarturl.it/7NewsDaily Facebook » https://www.facebook.com/7NewsAustralia Twitter » https://twitter.com/7NewsAustralia Instagram » https://www.instagram.com/7newsaustralia/ 7NEWS combines the trusted and powerful news brands including Sunrise, The Morning Show, The Latest, and 7NEWS.com.au, delivering unique, engaging and continuous coverage on the issues that matter most to Australians. Watch 7 News Australia full broadcasts and full episodes nightly at 6pm and weekdays at 11:30am and 4pm on Channel 7 and 7plus. #BREAKINGNEWS #7NEWS