Possibly. According to the IRS, a sole proprietor is someone who owns an unincorporated business by himself or herself. However, if you are the sole member of a domestic limited liability company (LLC), you are not a sole proprietor if you elect to treat the LLC as a corporation. In order to treat an LLC as corporation, the owner of the LLC would need to elect S Corp status or C Corp status.
Unless your father elected for the LLC to be taxed as a S corp or C Corp, then the LLC will likely be treated the same as a sole proprietorship.
@AbbieT
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