A man who survived a suspected grappa poisoning incident that killed three men on Queensland's Granite Belt has been released from hospital.

Joel Lynam, 21, Bryan Wilmot, 30, and Vincent Summers, 21, died in hospital from suspected poisoning, after drinking the grappa on a Ballandean property over the Queen's Birthday long weekend.

Joel's brother, 26-year-old Joshua Lynam, was the sole survivor and was discharged from a Brisbane hospital on Friday.

The family of the two brothers say they are shocked and saddened at the incident.

The family also says it is cooperating with a police investigation.

Family friend John Arlidge says it is a difficult time for their father Bill Lynam.

"People can probably understand that we're grieving about the loss of Joel and his and Joshua's friends Bryan Wilmot and Vincent Summers," he said.

"It's not yet certain what was present in the liquor the four consumed on the Saturday afternoon.

"Bill and Joshua are cooperating with the police investigation.

"Bill is shocked and fragile but [pleased Joshua's] eyesight seems to be OK and that he's no longer in danger.

"His wife Marilyn - who is Joel and Joshua's mother - died a few months ago after a long battle with cancer.

"You can understand that Bill and Joshua do not want to do any media interviews."

 

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