A Hewlett man was arrested Sunday for allegedly shooting a 10-year-old boy in the shoulder during a family gathering on Staten Island on Saturday, police said.

Semion Mosheshvili, 42, was arrested after turning himself into the 123rd Precinct in Tottenville at 12:01 a.m. Sunday, a police spokesman said. He was charged with criminal possession of a weapon, reckless endangerment, and acting in a manner injurious to a child less than 17 years old, police said.

Mosheshvili, who was attending the gathering at a home at 426 Deisius Street, allegedly began handling a firearm on the second floor around 7 p.m. Saturday, said police.

That’s when the 9mm firearm “accidentally went off,” shot through the floor, and hit the boy in the right shoulder, police said.

The gun used in the shooting belonged to the homeowner, police said. The child was not a resident of the home, according to authorities.

Arthur Gershfeld, Mosheshvili’s Manhattan-based attorney, said his client did not know the weapon was loaded.

“My client is a family man, he’s a great father, a husband, a working guy,” Gershfeld said Sunday. “He’s got five kids of his own and they were in the house, so you can only imagine that he would never intentionally put his own kids in danger.”

Police said Mosheshvili then fled the scene, although Gershfeld disputed that, saying that Mosheshvili’s wife took the injured child to the hospital while Mosheshvili drove his own five children home.

“Obviously it was a shock to everyone,” Gershfeld said. “As soon as he dropped off his children, we immediately drove together to the precinct.”

Police responded to the call at about 7:23 p.m. on Saturday that a 10-year-old boy was taken to Staten Island University Hospital in Prince’s Bay with a gunshot wound, a police spokesman said.

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The child was transferred to Staten Island University Hospital in Ocean Breeze for treatment, police said. The child is not expected to need surgery as it was more of a “graze wound,” the spokesman said.

“I think the government will investigate and they will come to a conclusion ... that this was an accident,” Gershfeld said. “Hopefully we can work something out and put this to rest.”

— The Associated Press