If there is a court order regarding the withdrawal it will contain a time frame, if not then you have until your statute of limitations would expire. You may contact the insurance carrier, but if you are going to get a new attorney - and you almost always should - then don't. Good luck.
You keep compounding the problem by not consulting with local and qualified personal injury litigation counsel. Please stop talking to the insurance company. You and for sure your son have claims that warrant separate counsel. Good luck.