The Warrnambool couple yesterday welcomed Justice Bernard Teague's interim report on the Black Saturday disaster which shattered their lives.

While encouraged by the report, the early findings have failed to reassure the Daveys that more lives will not be lost.

Their son Robert and his wife Natasha were killed at their Kinglake home on February 7, along with their children, Jorja, 3, and eight-month-old Alexis.

They were among 173 people killed in the fires which also destroyed more than 2000 properties, including several in the south-west.

The interim report recommended that the Country Fire Authority (CFA) educate communities to leave early or prepare and stay and defend their homes.

But the safest option was always to leave and not all homes are defendable, the report recommended.

Mrs Davey said that after being trained as part of the local fire guard group, Robert and Natasha had developed ``false expectations of their ability to fight a fire''.

Mrs Davey said she was pleased the commission had heeded her call for fires to be graded according to categories, like cyclones.

Warnings should include information about the fire's severity, location, predicted direction and the likely time of impact, the report said.

``If they had a warning that there was danger or an out of control fire heading towards them there's no way they would have activated any fire plan. Their main goal was to live,'' Mrs Davey said.

Natasha's father Michael Halls welcomed the interim report but chose not to comment as he was yet to give evidence to the commission.

Mrs Davey said that as the fire approached, Natasha rang her to ask which way they should flee, because they had no information from fire authorities.

"We have absolutely no confidence in the senior leadership of the emergency services,'' she said.

"The potential for that devastation to happen again for us still seems very real.''