Sgt. DB Gates says the woman was booked into jail early Saturday for investigation of one count vehicular homicide and two counts vehicular assault.
B.J. Myers with the King County Sheriff's Office said three people were inside the house when the Jeep came barreling through the home located in the 3400 block of East Lake Sammamish Shore Lane SE, just before 8 p.m..
The woman who was behind the wheel wasn't seriously injured in the crash. Her 3-year-old grandson, who was with her in the Jeep, also escaped injury, according to Myers.
A 70-year-old man, who was the driver's husband, was killed. The driver's 34-year-old daughter and 40-year-old son-in law were both seriously injured in the crash.
Investigators don't yet know what led up to the wreck, but Myers said it appears the woman was either just leaving or was attempting to park when she drove into the house.
Drug recognition experts are speaking with the driver to determine if drugs or alcohol played a role in the crash. Detectives from the KCSO major crime, and major accident units are handling the investigation.