Vardy's son is identified as Richard J. Vardy, 28.
According to court documents, Mr. Vardy shot at his son with a Taurus .357 Magnum revolver during a family argument.
The bullet first hit Mr. Vardy's wife Mary in the head, then struck his son in the chest, killing him.
Mary Vardy survived but is in intensive care at Liberty Hospital.
The shooting happened at a home in rural Plattsburg off Highway Y Tuesday night around 9:30 p.m.
The Clinton County Sheriff's Department and the Missouri Highway Patrol were on the scene Tuesday night investigating after they received a 911 call about the family argument.