A family of three has been killed in a devastating fire that engulfed a granny flat in Sydney’s southwest have been remembered as kind and devoted to their faith. WATCH THE VIDEO ABOVE: Three family members killed in Wiley Park granny flat fireKnow the news with the 7NEWS app: Download today ArrowThe fire broke out just after 9.30pm at a property on Cornelia Street in Wiley Park, trapping a 52-year-old father, a 43-year-old mother and their 16-year-old son inside. The victims’ family today described them as quiet people who kept to themselves and who were kind and devoted to their Buddhist faith. The blaze was so fierce that firefighters struggled to reach the granny flat, which was located behind the main house at the end of a narrow driveway. Credit: 7NEWSCampsie detectives are working alongside the State Crime Command’s Arson Squad and fire investigators to establish the circumstances surrounding the fire.