While I'm sure you can prove that your husband's company is a completely separate entity than yours and that you never shared any part of ownership in that company, and that the company or your husband could therefore not be responsible in any way under the suit again you and your company, the legal system will allow the other attorney to make the claim that has already been presented to the judge -- it will be your responsibility to prove that your husband's company is not a proper party to the class action lawsuit.
Further, you will have to retain an attorney to represent your company and your husband's company in the lawsuit, because you cannot represent an entity on a pro se basis. You can represent yourself without an attorney, but you cannot represent the companies without an attorney.
I wish I could provide some more specific information for you -- but at the end of the day, the other attorney is within legal bounds in making claims that your husband's company is a successor (you then simply need to prove that's not true and that your husband's company is separate and not a proper party; his company would then be dismissed from the suit -- or the judge might never allow it to become a party based on your arguments -- but you still have to make those arguments).
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