Real life movie of 3 brothers and a bear in a cave, do you know the name.?

Years ago I watched a movie about 3 brothers that live in a farm and they take an adventure, very funny ,going to search for a big bear,they take a filming camera and find out their small brother went without them knowing, they enter to the cave and bears wake up, at the end one of the boys flies his father small plane to the hospital where he is and at the end of the movie I found out it was from the real life and 2 of the boys were already working on a magazine or something like that, I wish my daughter could watch it but I can't remember the name.

Thanks