Mark Tromp, the man at the centre of a bizarre interstate family trip last week, has apologised for the "hurt and concern" caused by the saga.

Key points: Mark Tromp said his family had been through a 'difficult period'

Mark Tromp said his family had been through a 'difficult period' Hopes to make sense of the ordeal, return to a 'normal' life

Hopes to make sense of the ordeal, return to a 'normal' life Appeals for privacy for his family

The search for the family of five ended at the weekend when Mark Tromp was found running along a street in Wangaratta.

Son Mitchell Tromp said his parents were scared and thought they were being followed when they left their farm at Silvan, east of Melbourne, over a week ago.

On Sunday, Mitchell Tromp and his sister Ella said the road trip and subsequent separation of the family members was "a family matter".

In a statement released by a relative, Mark Tromp said his family had been through "a difficult period".

"We will soon be reunited and together," he said.

"I hope that we will begin to make sense of our ordeal and return to a normal life," he said.

Mr Tromp expressed his gratitude to Victoria and New South Wales police for their help.

"Without reservation, I apologise for the hurt and concern caused by these events," he said.

He also thanked health care professionals who had looked after the family's "physical and mental wellbeing".

Ella Tromp and Mitchell Tromp said they had been very confused by what went on. ( ABC News: Patrick Rocca )

Mother Jacoba Tromp and another daughter Rhiana remain in hospital where they are being treated by mental health professionals.

The youngest daughter, Ella Tromp, has been charged with stealing a car it was alleged that she used to drive from New South Wales back home after she left her parents near Goulburn.

"More than anything, my family and I need time to recover and receive appropriate assistance, including mental health services," Mark Tromp said.

"To this end, we request the media organisations respect our request for privacy."

Timeline of the family road trip

Monday, August 29

The family of five leave their Silvan redcurrant farm in a grey Peugeot station wagon with a large amount of cash, but bank cards and mobile phones are left behind

The family of five leave their Silvan redcurrant farm in a grey Peugeot station wagon with a large amount of cash, but bank cards and mobile phones are left behind Heading towards New South Wales, son Mitchell Tromp has his phone thrown out of the car window at Warburton, east of Melbourne

Tuesday, August 30

Mitchell leaves the family trip at Bathurst

Mitchell leaves the family trip at Bathurst The rest of the family travel to Jenolan Caves in the NSW central tablelands before the two daughters leave their parents at Goulburn

The rest of the family travel to Jenolan Caves in the NSW central tablelands before the two daughters leave their parents at Goulburn Daughter Rhiana is hospitalised with stress-related health issues at Goulburn

Daughter Rhiana is hospitalised with stress-related health issues at Goulburn Police visit the Tromp family home after Mark and Jacoba are reported missing and find the house unlocked and paperwork everywhere

Wednesday, August 31

The family's car is found in Wangaratta in Victoria's north-east after police receive a report that it was seen following another car

The family's car is found in Wangaratta in Victoria's north-east after police receive a report that it was seen following another car Police pull the car over and a man, believed to be Mark Tromp, runs away into a nearby park

Police pull the car over and a man, believed to be Mark Tromp, runs away into a nearby park The area is searched with sniffer dogs, but he is not found

The area is searched with sniffer dogs, but he is not found Mitchell and Ella Tromp make their way back to Victoria and arrive to find police at their farm

Thursday, September 1

Jacoba Tromp is found and taken by a member of the public to Yass hospital where she is assessed for stress-related health concerns

Jacoba Tromp is found and taken by a member of the public to Yass hospital where she is assessed for stress-related health concerns Mitchell and Ella appeal to the public for help to find their father

Mitchell and Ella appeal to the public for help to find their father Mitchell says his parents had mounting business pressures and were scared and paranoid when he left them on the trip

Friday, September 2

Jacoba Tromp is transferred to Goulburn hospital to be treated alongside Rhiana

Saturday, September 3

Mark Tromp is found on a street near the Wangaratta airport in "good health"

ABC/AAP