David Scott Smith, 66, and Travis Shane Smith, 32, are accused of "reckless arson" in connection with the Caldor Fire, which burned more than 220,000 acres across three California counties this fall.
More containment on the fire near Lake Tahoe means that some residents have been able to return, but a rash of new "suspicious" fires erupted over Labor Day weekend, officials say.
An estimated 50,000 people have been evacuated as the Caldor Fire rages on. Shelters are filling up and hotel rooms are hard to find, leaving evacuees struggling to cope with the uncertainty.
