A mother and former Paralympic swimmer has opened up about being banned from going on a children's merry-go-round at Dreamworld theme park. Karni Liddell, who has a muscle wasting condition and uses a wheelchair, said she was 'humiliated' after being booted from the ride in front of her three-year-old son. 'I was told I wasn't allowed to go on this kid's ride because I'm a risk because I'm in a wheelchair,' she said in a video posted on Facebook on Thursday. Karni Liddell (pictured) with a young competitor at a Sporting Wheelies event in Queensland Ms Liddell (pictured) posted a video...