The paternal grandfather of the Kahui twins has admitted lying to police about seeing one of the boys stop breathing.
Three-month-old Chris and Cru Kahui died after being admitted to a children's hospital in Auckland in June 2006.
The boys' father, Chris Kahui, was acquitted of their murder following a High Court trial in 2008.
On Friday, Banjo Kahui continued to give evidence at the inquest in Auckland and told Crown lawyer Simon Mount that he lied to protect Chris Kahui.
When asked why he lied to police, Mr Kahui said he did not know what was going through his head at the time, but his wife was dying in hospital and their family was already going through a lot of stress.
Mr Kahui also said he had gone looking for the twins' mother, Macsyna King, because he had been told the boys had breathing problems and she knew what to do when this occurred.
Mr Kahui told the inquest that more than once he could have and should have taken the twins to hospital, but did not realise they were injured or seriously ill.