Fred Oliver Watmough, 65, Kevin Watmough, 30, and Allan Watmough, 28, all of Lethbridge, face charges of assaulting a peace officer, resisting arrest and obstructing a peace officer.
The charges stem from an incident on Sept. 10, the day a power line was downed by high winds and sparked a massive grass fire.
Police allege the three refused to leave an area that officials had deemed unsafe and ordered people to evacuate.
Their next court appearance will be Oct. 31.
The fire forced about 2,200 people from their homes in several communities, including parts of Lethbridge, until the blaze could be brought under control.
The wind-whipped fire quickly scorched about 50 square kilometres of farmland and prairie grasses.
There were a lot of downed power lines, burned fence posts, scorched land and damaged out-buildings and vehicles.
(CJOC, The Canadian Press)