chris ball made a video to say goodbye to his family before taking his life .
he told them they were not to blame for his disease and that he loved them .
he had been suffering from depression for two and a half years .
he was turned away from brisbane hospital due to no beds 11 days earlier .
brisbane man , 21 , is the fifth family member to have committed suicide .
his mother kerrie keepa has started a petition to call on the government to allocate more beds for suicidal youths in hospitals .