If your father left you the car in his will, then the executor should not have sold the car to someone else. The executor is under a fiduciary duty to follow the terms of the will and can be held liable for failure to follow that duty. You should meet with an attorney to discuss your options.
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If the car was designated in your father's will to come to you and was in his name at death, then the car should have gone to you. I recommend that you contact an attorney to handle this matter for you.