Sharon and her daughters, Michelle Renee Giusti and Clara Arleen Giusti, were last seen at their family's farm five miles south of Port Townsend, Washington on March 5, 1963. Sharon's husband stated he had been working in the fields all afternoon. When he returned to the house at the end of the day, his wife and children were gone. A car, some clothing and some money was also missing from the residence.

Sharon's husband reported his family missing on March 9, four days after they were last seen. The day after he filed the report, Sharon's vehicle was found beneath a highway overpass more than two miles from the farm. It was unlocked and there was no indication of Sharon, Michelle or Clara's whereabouts. They have never been heard from again. Photographs of Clara are unavailable. Her date of birth is May 4, 1962; she was ten months old at the time of her disappearance. She has red hair and blue eyes.

Due to the long time period that has passed without any contact from the missing females, authorities believe they disappeared under suspicious circumstances and are probably deceased. Their cases remain unsolved.