A man stabbed his father several times in South Farmingdale Friday afternoon before stealing the vehicle of a nearby homeowner who had let him use his bathroom, Nassau police said.

The father was in the back yard of his Grant Street home when police arrived about 1:15 p.m. and saw him with stab wounds to the head and torso, said Insp. Kenneth Lack, a police spokesman.

The victim, 53, was in serious condition at a nearby hospital, Lack said, and police were hunting for the son, Eric Georgoulakos, 23. The father's name was not released.

The father and son had been arguing, and when officers first arrived at the house, Lack said, they believed the son was still inside.

Emergency services officers were called and the area cordoned off, police said.

But a few minutes later, a 911 caller reported seeing a man nearby, one who fit the son's description -- 6 feet 3 inches tall, with a crew cut and tattoos on his right arm of Jesus, a hummingbird and Greek writing, police said.

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Georgoulakos had gone a few blocks to a house on Washington Street, Lack said.

"He asked to use the bathroom and phone in the home," the inspector said. "The homeowner allowed him to do that and as he walks out of the house, he took car keys to the homeowner's car."

The car keys had been on the coffee table, and there was no confrontation between Georgoulakos and the homeowner, Lack said.

"I think it was unbeknownst to the homeowners until they saw the car gone," he said. "It took them a couple seconds to know what was going on."

Police are searching for Georgoulakos in the stolen vehicle, a 2004 tan Chevy Trailblazer with Pennsylvania plates.

Police ask anyone who sees him to call 911.