KEY POINTS:
Chris Kahui says he learnt his partner Macsyna King was having affairs with other men only after the death of their twins but refused to give a DNA sample to prove if he was their father, Manukau District Court was told.
The allegations of affairs came after three police interviews with Kahui were shown to the court.
In the interviews Kahui said he believed Ms King hurt their sons.
Police said Kahui refused to give a voluntary DNA sample because he did not care if the twins were not his biological children.
Kahui also said he "didn't care" Ms King was having affairs.
It was also revealed Kahui's father Banjo Kahui has a conviction for assault against a child.
Banjo Kahui and Stuart King, who has also has conviction for assaulting a child, were both in the house at the time police believe the twins received their injuries.
The evidence came as the depositions hearing into whether Kahui will be committed for trial over the deaths of his sons, draws to a close.
Chris and Cru Kahui were admitted to Middlemore Hospital on June 13 and died in Starship Children's Hospital five days later, last year.
The twins were killed either by a blow to their heads or by having their heads bashed against a solid object.
Their father was charged with their murder four months after they died.
Scans taken when they were first admitted to hospital showed both suffered from extensive brain injuries and Chris also had a broken leg.
Both babies suffered from subdureal bleeding and broken ribs.
The Crown's case is that the babies received their injuries while in the care of their father on the evening of Monday, June 12, 2006, when Ms King was out visiting her sister.
This afternoon defence lawyer Michele Wilkinson-Smith challenged Detective Sergeant Chris Barry of the Manukau CIB, who was second in charge of the investigation last year, about police using the media to place pressure on the family.
Mr Barry denied he had any dealings with the media at all, saying he had not used the media to put pressure on the Kahui family to talk to police or to paint them as uncooperative.
Mr Barry acknowledged Kahui's father Banjo had a conviction for assaulting a child but that it was "some time ago".
Mrs Wilkinson-Smith said Mr Kahui and Mr King, who both had convictions for assaulting children, were in the house during the relevant time police thought the twins were injured.
Mr Barry said he would not go that far but agreed that at the time Cru suffered breathing injuries both Mr Kahui and Mr King were at the address.
Mr Barry said he had asked Chris Kahui for a voluntary DNA sample to determine paternity but Kahui refused saying "even if the boys are not my boys, I do not care".
In the third police interview made on October 3 last year - after which he was arrested and charged with murder - Kahui acknowledged Macsyna King had affairs with other men but said he had found out from his sister Mona after the twins died.
Kahui said he confronted Ms King about the affairs but she denied them.
When asked how he felt about it Kahui said he "didn't care".
Kahui said Ms King often "whacked" him, which he thought was "out of frustration' but that he "didn't care".
Ms King was a good mother but tried to control him, he said.
When asked if he thought Ms King could have hurt their sons, Kahui said he thought she could have hurt them before she went out on the Monday afternoon.
Kahui said he did not believe his father, his sister's partner Stuart King or his sister could have hurt the twins.
This morning the court was shown the first of three police interviews, made on June 13 last year hours after his sons were admitted to hospital, which showed Kahui unable to answer police when challenged over who caused the fatal injuries to his sons, despite looking after them all evening.
The hearing continues tomorrow.
- NZPA
