A social worker has told a High Court jury the Kahui twins received few visits from family even though they lay dying in their hospital beds.

The Child, Youth and Family worker, who has name suppression, told the double-murder trial of the babies' father, Chris Kahui, that she did not see much of the family while the babies were on life support.

"What stood out was they were dying and there was hardly any family around them," the witness said. That included both Kahui and Ms King.

Kahui is alleged to have murdered his twin sons, Cru and Chris, in June 2006. He says someone else, probably their mother, Macsyna King, inflicted the fatal injuries.

The witness said family members did come to meetings with hospital staff which were dominated by Ms King, who asked repeatedly if the bleeding in the babies' brains could be tracked back to an exact time.

Ms King was polite but insistent, asking three times if machines the babies were hooked up to could determine when the injuries were inflicted.

Ms King was "non-emotive", did all the talking and at one point prevented Kahui from asking a question.

While the babies were in hospital, Ms King tried to obtain their medical records and doctors' notes, asking them to be passed on to her lawyer.

But she twice failed to give the witness numbers for the lawyer, who said she would have to discuss it with the doctors.

It was revealed earlier in the trial that the woman was not a legal practitioner.

Crown prosecutor Simon Mount asked the witness if she agreed it was logical for Ms King to be trying to work out when the injuries were inflicted and she said it "could be".

Earlier, a friend of the family, Rebecca Rangi, told the court she saw Kahui and Ms King fighting after Chris and Cru's tangi.

Kahui wanted to go but Ms King wanted to stay and when he could not convince her he was heard to say: "You don't give a f**k about our babies being dead."

She ignored him, Ms Rangi said, and remained at the party until the following day.