Police Chief Danny Ford says the Hruby family's son, Alan, has confessed to killing his parents, Jon and Tinker Hruby and his sister Katherine.
Police have been holding Alan on unrelated charges since he arrived home Monday.
Investigators have not confirmed it, but there are reports the family was shot to death.
It is not yet known when exactly that happened.
The last time someone from the family was seen was Thursday of last week.