Mr Reardon said his 29-year-old son, Damien, woke up to the bear breaking open their dining room door in Newfoundland, Canada overnight.
The 55-year-old father said he fired two shots over the bear's head to frighten it.
"A polar bear doesn't usually back down," he said.
His cousin, Daniel Reardon, said the bear broke in doors at three other homes and killed sheep and ducks at a nearby stable without stopping to eat them.
Royal Canadian Mounted Police said wildlife officers shot the bear, which witnesses estimate weighed at least 135 kilograms.
This has to be caused by global warming!