Deidre Shelford egged her sons on to continue assaulting a man whose injuries were so serious he couldn't walk, talk or recognise his own daughter.
The 55-year-old Whangārei mother was jailed by the Whangārei District Court to seven years' imprisonment following lengthy prison sentences handed to her two sons for the vicious attack in Otangarei on January 8, 2017.
Unlike her sons who pleaded guilty, she was found guilty by a jury on one charge of with intent to cause grievous bodily harm caused grievous bodily harm.
Her son Tangaroa Samuels, 20, king hit Shane Lemon across the back of his head with a plank of wood outside the Otangarei house where the latter lived with his partner and three grandchildren.
After he was hit, Lemon's head struck the concrete driveway and he began to convulse.
Tangaroa Samuels was jailed for nine years and six months while his brother Frederick Samuels got eight years.