They then attempt to return Bruno to his parents and get them to flee the hotel in case things go wrong , but they refuse to believe Helga 's story about Bruno being turned into a mouse and declare her to be insane .
They then attempt to return Bruno to his parents and get them to flee the hotel in case things go wrong . 
 However , Bruno 's parents refuse to believe Helga 's story about Bruno being turned into a mouse and declare her to be insane .