Many times a passenger and driver injured in the same auto accident will seek out to have the same attorney work on the case. But, that is not always a good idea. The reason is because the attorney may have a conflict of interest if it is shown that his driver-client may have been at fault for the accident (either fully or partially), while the passenger obviously has no fault for the accident.
That happens from time to time and when it does, the attorney must withdraw from the case. Usually, the best option is for the passenger and driver to go to different lawyers at the start of the case, in order to avoid any problems down the road, should a conflict suddenly develop.