Former world rally champion Colin McRae is believed to have been killed along with three others in a helicopter crash near his home in Lanarkshire.
The helicopter, which police believe was owned by Mr McRae, 39, came down onSaturday afternoon in Jerviswood, about a mile from Lanark, and caught fire.
Mr McRae, his son Johnny, 5, friend Ben Porcelli, 6, and Graeme Duncan, 37, died following a helicopter crash in Lanarkshire on Saturday.
Jim McRae, Colin McRae's father, said it was "unbelievable" that his son and grandson's lives had been taken "so prematurely".
He issued his statement a few hours before police began removing the bodies of the four from the crash site.
Mr McRae snr said that his grandson's friend Ben was a "great buddy" and that Mr Duncan was a close friend of Mr McRae since school.
Speaking on behalf of the whole family, he added: "It is with much sadness and regret that we have to make this statement."
"It is unbelievable that Colin and Johnny's lives have been taken so prematurely and in such a tragic manner.
"Colin was a great son, a loving husband to Alison and a fantastic father to Johnny and his big sister Hollie.
"Johnny was a great wee guy, spending every spare minute with his dad, and even at this early stage it looked like he had the potential to carry on the family dynasty."
He said the family's thoughts were "very much" with the families of Ben and Mr Duncan.
"Ben was a great buddy of Johnny's and they had always spent a lot of time together both in and out of school," he added.
He said Mr Duncan, who lived in France, was back in Lanark on holiday.
"We are thankful for the overwhelming number of messages of support we have received from all around the world," Mr McRae Snr said.
"Colin was very much an inspiration and role model to motorsport fans the world over."
In a statement, Ben's father Mark and mother Karen, said: "We are absolutely devastated with the loss of our son Ben following this terrible accident.
"He was a charming, fun-loving and caring wee boy - the best boy in the world who enjoyed great times with his wee pal Johnny. It is just so tragic that their lives have been cut so short.
"Our thoughts also go out to the McRae and Duncan families."
Formal identification is expected in the next few days.
Ch Supt Tim Love from Strathclyde Police said the crash was not survivable and it was very difficult to tell the aircraft had been a helicopter.
Air accident investigators have started searching the helicopter crash site near Mr McRae's home.
The Scottish Subaru Impreza Owners' Club have been leaving tributes at the entrance to the house.
About 40 firefighters attended the accident which happened in woods just north of Lanark at 1600 BST.
Users of the rally champion's official website www.colinmcrae.com were greeted by a black screen on Sunday with no information available.
Mr McRae was Britain's first rally world champion in 1995 and is the son of five times British rallying champion Jimmy McRae.
Mr McRae admitted to enjoying the adrenaline rush of activities such as bungee jumping and was a keen pilot.
Tributes from his contemporaries and friends continue to pour in.
Nicky Grist, his co-driver since 1997, said: "Colin was always regarded as being a bit of a risk-taker in cars, but when it came to flying a helicopter he was a totally different man.
"The one thing he always told me, he said 'You don't mess about with a helicopter. They are bigger and better than I am and you have to drive them as such."
Rev Bryan Kerr, minister of Lanark Greyfriars Church and a neighbour of the McRae family, said: "A lot of people have been stunned by this and our thoughts go out to all of the families affected.
"This will be hugely devastating, particularly in such a small community. You just don't expect these things to happen on your doorstep especially when it is someone who is so well known and well liked in the town.
"The town's ministers have spoken to each other and special prayers will be offered for all those affected by the tragedy and remembering those who are working on the rescue efforts and trying to piece together what happened."
First Minister of Scotland Alex Salmond said: "Colin McRae was an outstanding Scottish sportsman of international stature and achievement.
"His death is a great tragedy, and my thoughts and condolences are with all the families and friends bereaved by this terrible accident."
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