A Tennessee man lost one of his legs after his son — trying to fend off the 76-year-old’s chainsaw attack — drove over his pop with a lawn mower.

Douglas Ferguson, 76, was trying to attack his son with a running chainsaw as the younger man mowed the lawn at a home on U.S. Highway 421 back on June 28, according to a police statement obtained by the Bristol Herald-Courier.

When cops arrived, Ferguson was bleeding from his leg and his head.

The pair had been squabbling for a while, cops said.

Police were unable to serve an arrest warrant for Ferguson until Tuesday, because of the severity of his injuries.

He was charged with second-degree attempted murder, as well as a probation violation on an original charge of aggravated assault, according to the report.

He was jailed on both charges, and bail was set at $25,000 for the attempted murder bust, cops said.