Is it possible for another man to adopt my children without my permission. I know it seems an odd question...but I have some evidence that my wife has been conspiring with her "lover" to marry and form a family with our children and his. Adoption appears to have been discussed.
Every state has different laws about this, but generally if the parents are known, they need to give consent to an adoption unless a court has taken away that right from them. More about this here: http://www.abcadoptions.com/consent.htm