A mum forced to lock her fridge and kitchen cupboards to stop her 17-stone schoolboy son from raiding them has hit back at sneering strangers who "think she's a bad parent ". Courtney Graham's son Caden, 12, was diagnosed with rare genetic condition, Prader Willi Syndrome, at just four days old. The syndrome, which is caused by missing genetic material, causes learning difficulties , behaviour challenges and an excessive appetite that can easily lead to dangerous weight gain. The condition led