If my father was partially in the turn lane stopped and a car came speeding down the turn lane and hit my father’s car, who is at fault?

My father was let out of a parking lot by stopped traffic turning right. He crossed one lane of stopped traffic to an open left turn lane where traffic was also backed up. The front nose of his car was in the turn lane as he was the last one in line. Once traffic started to move before my father could move, a car came speeding down the turn lane and hit the driver’s side corner of my father's car with the passenger side of theirs.