(KMOV.com) -- The family of a missing Missouri mother of triplets is distraught, but relieved that police are taking her disappearance seriously.
Jacque Sue Waller, 39, was last seen Wednesday in St. Genevieve, Missouri. The Major Case Squad was activated after Waller failed to return home.
Waller's car, a blue Honda Pilot, was found abandoned on Interstate 55. Police say they do have a person of interest, but are not naming that person directly.
The Cape Girardeau County Sheriff's department is examining a truck and a boat that belongs to Waller's estranged husband. Dive teams have searched two ponds on the property where he lives.
Police are not releasing many details about the investigation including reasons why they are investigating Waller's estranged husband.
Waller's sister said, "She's just been an awesome mother and she would have never left...never."