Listed As An Employee Without Knowing, And Now Asked To Relinquish Shares?

A family member owns his own business, and listed me as an employee without my knowledge (I assume to get some kind of tax break? I was never paid anything…) and is now asking me to sign a resignation letter he developed that asks me to relinquish shares. Additional backstory, I have no idea what the shares would be worth, and, there’s currently an active lawsuit between this family member’s business and a client (I don’t know the details).

My concerns are 1) by signing this letter, I assume this would acknowledge that I knew he was claiming me as an employee which could put me at risk? Especially with this active lawsuit? And 2) should I be giving up shares without knowing the extent of what they offer?

Letter states:

“This shall serve as my notice of resignation from serving as Secretary for [company].

With a new baby and other obligations I will not have time available for participation in the Corp’s activities.

The resignation will be effective December 31, 2024. I agree to transfer my 20 shares to you at no cost or obligation.”