WAUKESHA, Wis. (CBS 58) -- A mysterious death investigation is underway tonight in Waukesha, as detectives are searching a home on the city's southwest side.

One person is dead, two others are still missing, according to the Waukesha County Sheriff's Office.

The first call came in just before 10 a.m. on Friday, Feb. 28, when a woman called 911 to ask for a wellness check on the home.

She said her grandson's school called her to say he had not been to class for a while. She also said she hadn't spoken with her son or his wife in a few weeks.

Deputies found one person dead when they arrived; they have not given a name or age.

Two other people are still missing; authorities have not said if they believe those two are alive or not, and no names or ages for them.

An incident command post was on site for hours, and CBS 58 saw investigative teams back their cars up to the garage. Most of the lights in the home were on as detectives went in and out of the home.

Aerial maps show two ponds behind the home, and a line of trees. Before the sun went down, investigators used drones to search the surrounding property.

We do have some audio that shares some more information about that first 911 call.

"Caller's out of state requesting a wellbeing check on her son, [name redacted], his wife, and their teenage son. Caller got a call today from the teenager's school and advised that they hadn't been to school in a long time. Caller hasn't had contact with anyone there in a couple weeks," said an officer via Broadcastify.

Later in the law enforcement communication, they said they spoke with the school resource officer at Waukesha West High School.

That SRO told authorities the teen who lives at the home had perfect attendance, so it is really out of the ordinary that they'd miss two weeks of school without anyone calling them out.

A neighbor told CBS 58 the man who lives in the home is the Clark Griswald of the neighborhood, referencing elaborate holiday light displays, but he also said he doesn't really know the family very well.

The Waukesha County Sheriff's Department says they're actively working to determine the circumstances surrounding this incident.

At this time, officials do not believe there is a threat to the community.

This is a developing story. Stick with CBS 58 for updates on-air and online.