What are my options if I don't agree with the walk away package being offered to me?

I am an executive with a statutory required position (Chief Financial Officer). Abiding by my fiduciary rights, I did not fall in line with the recently appointed CEO as a "yes" man when asked by his father, outgoing CEO and still Chairman of the Board in a family run business in which the COB owns 34% (there is a 49% public float). I believe that the CEO is retaliating against me and has decided to let me go. It is possible that he has swayed the Board already (though the Board never spoke to me). Additionally, I have been ?whistleblowing? to a Board director, whom unfortunately to me, resigned recently. I have communicated with this individual during the past few years advising of mismanagement (of the COB, then CEO). Additionally, another son has created a hostile work environment, which a non-family HR Director is fully aware (as is the Board director whom I have been notifying), but nothing has been done (hostile work environment is directed against a number of employees.