One of the Mongrel Mob members killed in a crash on the way to the gang's 50th anniversary celebrations at the weekend died on his late grandfather's birthday.

TerryShane Stone, 31, was a father of two, and died alongside two other Mongrel Mob members on Saturday after their car plunged down a bank into the Mohaka River.

They were Ronald Rigby, 53 and Nathan Isaac, 29.

Mr Isaac was also a father. His partner Jaz Ruawai said he would be missed.

"Fly high my love, my babies daddy, my headache, my sadness, my happines, my everything. We love you and we are gonna miss you so much," she wrote on Facebook.

A fourth man survived but has not been named. All four men were from Wairoa.