Abraham Tu'uheava was shot dead and his wife Yolanda severely injured on Greenwood Road on 1 May last year.
Cousins Fisilau Tapaevalu and Mesui Tufui were found guilty of murder and attempted murder in the High Court at Auckland in June.
Another cousin Villiami Taani - a patched Comancheros member - admitted the charges before trial and was jailed for life with a minimum non-parole period of 17-and-a-half years last month.
The three men met Abraham Tu'uheava on the rural stretch of road to carry out a methamphetamine deal in the late hours of 30 April.
