SEATTLE — A Saturday morning house fire killed two adults and their three children in a rural area southwest of Olympia, according to the Thurston County Sheriff’s Office. Neighbors called to report the fire around 6:30 a.m. and firefighters found the house “completely engulfed in flames” with five people inside, according to the sheriff’s office. The home was on Sherman Valley Road Southwest near the Capitol State Forest. One girl, a family friend, escaped the fire without serious injuries, said spokesperson Lt. Cameron Simper. Authorities have not yet released the names and ages of the victi…