I Demand A reversed Adoption

My husband adopted my biological son and planned A divorce before the Adoption without
informing me of his plans. less than a year later my husband filed for divorce and took my son and he is seeking full custody. I am concerned because i feel my husband has mental problems and will harm my son emotionally and he is turning my son against me. i want the adoption to be reversed and my son returned back to me. i am his biological mother.