A southern Queensland man has been found guilty of manslaughter over three deaths linked to a home-brewed grappa he made in 2013.

William Neil Clarence Lynam, 71, brewed the alcoholic drink on his property in Ballandean in June 2013.

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Following a seven-day trial in the Toowoomba Supreme Court, Lynam has been convicted of three counts of manslaughter and one count of grievous bodily harm.

Four men drank the brew and three of them died in the following days from suspected methanol poisoning.

Lynam’s son, Joel Lynam, 21, died at the property.

Bryan Wilmot, 30, was rushed to Toowoomba Hospital in a critical condition but died despite receiving treatment.

Vincent Summers, 21, from Stanthorpe, died in Brisbane’s Princess Alexandra Hospital.

Lynam’s other son, Joshua Lynam, 29, survived after drinking the brew but now lives with partial blindness.

Lynam will be sentenced on Wednesday.