Co-leader of the Maori Party Pita Sharples is confident the family of the dead twin baby boys in Auckland will talk to police on Monday.
Three-month-old Cru and Chris Kahui died from brain injuries in the Starship Children's Hospital on Sunday, June 18.
Post-mortem examinations were conducted on June 19 and their deaths are the subject of a double homicide investigation. Both had head injuries and one also had a broken thigh bone.
Their tangi was held in South Auckland on Saturday.
Police say their family has stonewalled the investigation.
Detective Senior Sergeant John Tims late last week said police believe that family members met after the twins had been taken to hospital and decided not to co-operate with the investigation.
Sharples has talked to police and the twins' family and says an agreement was made that someone from the whanau would voluntarily go to police on Monday.
He says police agreed to wait so the family could bury the babies and grieve over the weekend.
Maori Affairs Minister Parekura Horomia is suggesting cross-party talks should be held on family violence following the deaths of the infants.
Horomia says he is getting "peeved" that people are saying violence toward children is a matter for Maori alone.
He says he will work on a plan in the next few days for cross-party talks on what he says is a wider issue.