About 70 residents remain distressed and unable to cope after being spread out across nearby nursing homes following the shock closure of the Earle Haven Retirement Village.
A committee made up of Queensland politicians from across the political spectrum will now use coercive powers to get to the bottom of what went on at the home.
"It is a national shame that this has happened," Labor MP and Health Committee Chair Aaron Harper said on Friday.
"Everyone deserves answers. Our priority is to ensure what has happened at Earle Haven doesn't happen to other homes and residents."