A Bridge City man shot his granddaughter’s boyfriend in the groin with a shotgun after the boyfriend forced his way into a house and violently beat the man, authorities said.

Miguel Ramirez, 25, of Marrero, was arrested early Monday at a Kenner hospital where he sought treatment for his wounds, said Capt. Jason Rivarde, spokesman for the Jefferson Parish Sheriff’s Office.

Ramirez is also accused of kidnapping his 22-year-old girlfriend after attacking her grandfather, 66.

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The violent confrontation began Sunday night when Ramirez and his girlfriend were involved in a “physical altercation” somewhere in New Orleans, according to Rivarde. No details were available Thursday about that incident.

After the fight, the couple went to her grandparents’ home on 15th Street in Bridge City about 11:30 p.m. to pick up their three young children, according to Rivarde. The woman went into the house to get the kids, who are under the age of 5.

The woman told her grandfather about the altercation and asked him to contact authorities for help.

But before he could call 911, Ramirez stormed into the house and began beating the grandfather, authorities said. The grandfather suffered a broken nose, severe swelling around his eyes and bruising on his face.

Ramirez then grabbed his girlfriend and dragged her out of the house, according to Rivarde.

“The grandfather, fearing that (Ramirez) is going to harm his granddaughter, gets his shotgun and fires one time,” Rivarde said.

Ramirez managed to get to his vehicle and drive off with his girlfriend.

The grandfather didn’t realize that he had wounded Ramirez, who had been shot in the groin and thigh, Rivarde said. He called 911 to report the home invasion.

Meanwhile, Ramirez drove to Ochsner Medical Center in Kenner. Emergency room doctors there notified authorities about the gunshot wounds, and Sheriff’s Office investigators arrived.

Ramirez was later booked into the Jefferson Parish Correctional Center in Gretna on counts of home invasion, second-degree battery, simple kidnapping and domestic abuse-child endangerment. He was being held without bail Thursday, according to jail records.