A two-alarm fire broke out in the attic of a 2½-story, single-family house in West Roxbury Friday morning, displacing a family of three, fire officials said. The blaze began at about 9:35 a.m. on Beech Street and caused roughly $150,000 in damage. The second floor and attic received the most damage, but the entire residence suffered extensive water damage, said Fire Department spokesman Steve MacDonald. Two adults and a teenager were displaced by the fire and will be staying with family and friends until their home is habitable, he said. No injuries were reported, and the cause of the fire has not yet been determined.