There they were treated for minor injuries and shock, and are being given counselling.
Jean-Marie Bogini, the mayor of the village of Isola confirmed that there was a landslide. "There were seven people in the house - five adults and two children," he said.
He added that while some family members escaped, the seven and the 10 year old could not get out.
Gendarme commander Gael Marchand said: "Three of the survivors managed to get out of the rubble alone, while the remaining two had to be freed by the emergency service."
He added that the boulder first landed on the road above the chalet, but then bounced down.
"One possible reason for the landslide is that the cliff was in a very fragile state due to a long period of heavy rain, followed by a thaw," he said.
Roads nearby the scene were closed off as police investigated the area.
In 2009 the resort of Isola 2000 was completely blocked off when three avalanches fell on roads leading up to it, with hundreds of Britons among those trapped.
- UK Independent