When father and son Craig and William Rochus vanished from their Rosebud home a week ago, they only took two things: a computer and a photograph.
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The lights at the Cass Street house were left on, there were dirty mugs still in the sink and no clothes had been taken.
As Mr Rochus's concerned mother Lynn Auld put it: "it was like they just went out to get takeaway".
The other thing they took was Mr Rochus's champagne-coloured Mitsubishi Verada sedan, which police hope might help lead them to the missing pair.
Police are appealing for public assistance in their search for Mr Rochus, 49, and his 15-year-old son, who were last seen at their home last Tuesday, just before 1.30am.
There are concerns for Mr Rochus's welfare - he has not picked up his medication after going missing.
William has been absent from Rosebud Secondary College for the past week.
Mrs Auld said Mr Rochus had been struggling recently with mental illness, particularly after the death of his father.
She believed the stress - and her trying to offer help - may have led to him disappearing.
"I've known for a few months that he wasn't himself and that he should go to the doctor," she said.
The relationship between the father and son was "beautiful", said Mrs Auld .
She described her grandson William as a "very soft boy who just loves his dad".
"He would stay with Craig to the bitter end, he's so loyal," she said.
Mrs Auld said text and Skype messages had gone unanswered, as concerns for the father and son's whereabouts escalated.
At one point, Mr Rochus did make contact from a phone box. He rang his mother to tell her that she had "ruined his life".
"He said 'we're not on the [Mornington] Peninsula, you will never find us'," she said.
William's mother, who lives in Queensland, hasn't heard from them either.
Mrs Auld said she was very concerned about where her son might be.
For now, she's waiting by the phone for any sign of good news.
"Craig is not a well person, his life revolves around William and his care," she said.
"He's a beautiful man. He has a beautiful soul but they need to come home."
Police have released a picture of Craig and William Rochus and ask anyone who sees them or the Mitsubishi to contact Rosebud Police on 5986 0444.
The car has the registration number OFO156.
