Slain Otorohanga grandmother Clare Bremner to be farewelled alongside son Ross, who stabbed her shortly before his own death

Keith and Clare Bremner, with their daughter Loren. Photo / Supplied

Slain Otorohanga grandmother Clare Bremner will be farewelled alongside her son Ross, who fatally stabbed his mother and critically injured his father Keith last week.

Ross' body was found four days later alongside two others in a remote Waitomo district bach.

Bremner family neighbour and long time friend, Dennis Kaumoana, said mother and son would be farewelled at a private joint funeral at St Bride's Anglican Church in Otorohanga on Tuesday next week.

It is not known if Keith Bremner will attend the funeral. He remains in a critical condition in Waikato Hospital's intensive care unit.

However, Kaumoana said Jo Kukutai, the daughter of Te Kuiti couple Mona Tuwhangai and Maurice O'Donnell, killed by Ross Bremner at their Kawhia bach after the attack on his parents, was expected to attend Tuesday's service.

Kaumoana is related to Tuwhangai and told the Herald he had asked Clare and Keith Bremner's daughters, Loren and Kylie, if Kukutai could attend the funeral.

"I asked if I could bring her, as a closure to what has happened."

The elderly couple's family also wanted to reiterate they felt no animosity to Ross Bremner or his family, Kaumoana said.

The sisters gave their blessing, he said.

Kaumoana said he had met with the sisters yesterday, when they returned to the family home Cruden Ave for the first time.

"They were tearful at the beginning, but they are ok."

He had not seen Keith Bremner, but was updated on his progress by one of the sisters, Kaumoana said.

"[Medical staff] are going to try to get him to spend a bit more time alert ... more time awake instead of sleeping."

Keith Bremner had not spoken, but had responded to requests to move his limbs in response to questions, Kaumoana said.