one going straight lane, one right turn lanes before the intersection of XXX & YYY。When our car was ALREADY on the left turn lane at XXX Dr., the other part on the straight lane suddenly tried to merge to the left turn lane without shoulder check or blind spot check, or any signal. So that our right front door was hit by the other party’s left front head(above left front wheel) and our right rear door was scratched. The problem is that our car enters into the left lane a little earlier, the other car is on the straight lane waiting for red light. Whose fault?