NEW YORK (CBS 2/AP) — Two little children, a brother and sister, were hit by a car that jumped the curb in front of their Queens home Sunday.

The sister, just four years old, is now in the fight of her young life.

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A boot belonging to four-year-old Aicha Sylla was left behind at the crash scene outside her family’s home in Queens. She’s hospitalized and fighting for her life, listed in critical condition.

Aicha and her 11-year-old brother, Tyzian, were steps from the front door when they were struck by a Mercury Sable sedan. The children’s nine-year-old brother, Mohamed, bolted out of the house to see the immediate aftermath.

“I ran outside with my mom and I saw the blood, and Tyzian on the floor trying to come up here,” Mohamed said.

The children were returning from a quick walk to a nearby store to get school supplies when the car careened off North Conduit Avenue near 160th Street.

The kids’ aunt and uncle arrived to take Mohamed to the hospital, where the family held vigil at the two bedsides.

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“It’s not easy,” the uncle said. “There is nothing I can say.”

As the brother and sister were transported to Long Island Jewish Medical Center, police detained and questioned the driver. Police don’t believe he was drinking and no criminality is suspected in the accident, though officers later arrested him for reasons unrelated to the crash.

Police say the 39-year-old driver, Anthony Grays, violated an order of protection by being with the woman who was his passenger. He is being charged with criminal contempt.

Witnesses said it appeared the driver and passenger may have been arguing and distracted at the time of the crash.

“It’s really crazy,” neighbor Sultana Razia said.

The Sylla family, originally from West Africa, moved into the home three years ago. The new house is now broken, and a family is left devastated.

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The accident remains under investigation.