A 6-year-old boy who was struck by a sport utility vehicle and seriously injured as he crossed a street with his siblings and mother in Huntington Station was improving Sunday and was expected to survive, Suffolk police said.

The boy suffered a serious head injury Saturday afternoon when he was hit as the driver, Ralph Williams, 49, of Westbury, turned left from Academy Place onto New York Avenue, police said.

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One of the boy's sisters, 3, had a finger cut, while another sister, 11, had a minor head injury. Their mother, Dorothy Blue, 35, of Medford, and another child, 3, were not injured, police said.

The three siblings had been taken to Huntington Hospital, but the 6-year-old was transferred to Cohen Children's Medical Center in New Hyde Park, Queens.

Although police said the incident appeared noncriminal, an investigation is continuing.